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(Round your answer to the nearest whole number.)
A grey squirrel population was introduced in a certain county of Great Britain 35 years ago. Biologists observe ...
(Round your answer to the nearest whole number.)
A grey squirrel population was introduced in a certain county of Great Britain 35 years ago. Biologists observe that the population doubles every 7 years, and now the population is 80,000.Estimate the squirrel population 10 years from now.
Review t test and ANOVA
Part A. Dependent t testIn this assignment, we are interested in finding out whether participation in a creative writing c ...
Review t test and ANOVA
Part A. Dependent t testIn this assignment, we are interested in finding out whether participation in a creative writing course results in increased scores of a creativity assessment. For this part of the assignment, you will be using the data file “Activity 8a.sav”. In this file, “Participant” is the numeric student identifier, “CreativityPre” contains creativity pre-test scores, and “CreativityPost” contains creativity post-test scores. A total of 40 students completed the pre-test, took the creativity course, and then took the post-test.Exploratory Data Analysis/Hypotheses.Perform exploratory data analysis on CreativityPre and CreativityPost. Using SPSS, calculate the mean and standard deviation of these two variables.Construct an appropriate chart/graph that displays the relevant information for these two variables.Write the null and alternative hypotheses used to test the question above (e.g., whether participation in the course affects writing scores).Comparison of MeansPerform a dependent t test to assess your hypotheses above (note that many versions of SPSS use the term “paired samples t test” rather than dependent t test; the test itself is the same.Write one or two paragraphs that describe the dataset, gives your hypothesis, and presents the results of the dependent sample t test. Be sure that your writing conforms to APA style.Part B. Independent t testIn this assignment, we will start with the data file used in Part A (“Activity 6a.sav”). Suppose, however, you [the researcher] encountered a small problem during data collection: after the post-tests were collected, you realized that the post-test form did not ask for the students’ identification number. As such, it will be impossible to match pre-test scores to post-test scores. Rather than simply give up, you start thinking about the data you do have, and try to determine whether you can salvage your project. In assessing the situation, you realize that you have 40 pre-test scores and 40 post-test scores, but no way to link them. While it will result in a weaker comparison, you determine that you are still able to compare pre-test vs. post-test scores; you will use a between-subjects design rather than a within-subjects design.Create the data set.Using the “Activity 8a.sav” file as a starting point, create a new dataset that you can use with the between subjects design. Hint: you will no longer need the variables CreativePre and CreativeTest. Instead, you have only one variable for the score on the creativity test. A second (or grouping) variable will serve to indicate which test the student took.Submit the dataset as one of the week’s files. Name the file in the following format: lastnamefirstinitialPSY7107-8b.sav (example: smithbPSY7107-8b.sav).Exploratory Data Analysis/Hypotheses.Comparison of MeansPerform an independent t test to assess your hypotheses above (note that many versions of SPSS use the term “independent samples t test” rather than simply “independent t test”.Write one or two paragraphs that describe the dataset, gives your hypothesis, and presents the results of the dependent sample t test. Be sure that your writing conforms to APA style.Comparison of DesignsIn this assignment, you used the same dataset to analyze both a between- and within-subjects design. Create a single paragraph (using the material you wrote above), that presents both sets of results.Explain, in 300-500 words, whether the two tests resulted in the same findings. Did you expect this to be the case? Why or why not? What have you learned in this assignment?Part C. ANOVAAll of us have had our blood pressure measured while at our physician’s office. How accurate are these measurements? It may surprise you to learn that there is something called “white coat syndrome”—the tendency of some people to exhibit elevated blood pressure in clinical (medical) settings only. In other words, for these people the very fact that the physician is taking their blood pressure causes it to increase (for more information about white coat syndrome see http://www.webmd.com/anxiety-panic/features/beyond-white-coat-syndrome ). In this assignment, you will be using the “Activity 8c.sav” data file to determine whether you find support for the existence of white coat syndrome. In this study, 60 participants were randomly assigned to one of three groups. The “settings” variable indicates the location in which the participants’ blood pressure was recorded: 1=home, 2=in a doctor’s office, and 3=in a classroom setting. The “SystolicBP” variable contains the participants’ systolic pressure (the “upper” number). The “DiastolicBP” variable contains the participant’s diastolic pressure (the “lower” number).Exploratory Data Analysis/Hypotheses.Perform exploratory data analysis on both the SystolicBP and DiastolicBP variables. Using SPSS, calculate the mean and standard deviation of these two variables. Be sure that your analysis is broken down by setting (e.g., you will have six means, six SD’s, etc.).Create two graphs—one for systolic and one for diastolic pressure. Each graph should clearly delineate the three groups.Write a null and alternative hypothesis for the comparison of the three groups (note that your hypothesis will state that the three groups are equivalent; be sure to word your null hypothesis correctly).ANOVA.Using the “Activity 8c.sav” data file, perform two single factor ANOVAs: one using SystolicBP and one using DiastolicBP as the dependent variable.If appropriate for either or both of the ANOVAs, perform post hoc analyses to determine which groups actually differ.Write one paragraph for each ANOVA (be sure to use APA style). At a minimum, each paragraph should contain the three means, three SD’s, ANOVA results (F, df), post hoc tests (if applicable), effect size, and an interpretation of these results.Save and name your Word document in the following format: lastnamefirstinitialPSY7107-8.docYou should now have the following files:lastnamefirstinitialPSY7107-8b.sav (example: smithbPSY7107-8b.sav)lastnamefirstinitialPSY7107-8.doc
PUBH 8500 WU WK 10 Numeric Descriptive Statistics Census Region Analysis
Assignment: The Effect of Weights
“The use of sampling weights and sample design variables is recommended for all analys ...
PUBH 8500 WU WK 10 Numeric Descriptive Statistics Census Region Analysis
Assignment: The Effect of Weights
“The use of sampling weights and sample design variables is recommended for all analyses because the sample design is a clustered design and incorporates differential probabilities of selection. If you fail to account for the sampling parameters, you may obtain biased estimates and overstate significance levels.”
In other words, samples selected for surveys may have imperfections in their representation of the reference population. Imperfections include the selection of sampling unit with unequal probability, non-coverage of the population, and non-responses to survey questions. Sampling weights would be used to compensate for these imperfections and produce valid and reliable results.
For this Assignment, you analyze the relationship of two variables with logistic regression, using both weighted and unweighted data. You then compare the results to identify the effect of weighting on the interpretation of the relationship.
The Assignment
Examine the Data (30 Points)
Open the Week 10 Dataset (SPSS document) located in the Learning Resources area.
Produce numeric descriptive statistics for the following variables:
Cregion
USR
Sex
Q1
Q6a
Q16
Q22a
Receduc
Race/Ethnicity
Logistic Regression
Use SPSS to run a logistic regression model with Q22a. “Have you ever looked online for -- Information about a specific disease or medical problem?” as your dependent variable (Note that there are 4 levels of responses possible, but only 2 are actually used in the responses so you can state the dependent variable is a binomial and use binary logistic regression) and Sex as the independent variable.
Use backwards stepwise regression to add Receduc to the model as a potential confounder.
How does the relationship between Q22a and Sex change with the addition of Receduc? Include a discussion of Odds Ratios and the Model Summary in your answer. Would you consider Receduc a confounder? Is it worth keeping it in the model even if it does not coufound the relationship between Q22a and Sex in this sample?
Logistic Regression with weights
Weight cases using the variable standwt (Standardized weight)
Use SPSS to rerun a logistic regression model with Q22a. “Have you ever looked online for -- Information about a specific disease or medical problem?” as your dependent variable, Sex as the independent variable, and Receduc as a covariate.
How does weighting the cases change the outcome of the logistic regression?
Discuss why it is important to weight cases from surveys with complex sampling schemes using the differing outcomes you have from parts 2 and 3 of this assignment.
Gulf Real Estate Properties
Gulf Real Estate Properties, Inc. is a real estate firm located in southwest Florida. The company, which advertises itself ...
Gulf Real Estate Properties
Gulf Real Estate Properties, Inc. is a real estate firm located in southwest Florida. The company, which advertises itself as an “expert in the real estate market,” monitors condominium sales by collecting data on location, list price, sale price, and the number of days it takes to sell each unit. Each condominium is classified as Gulf View if it is located directly on the Gulf of Mexico, or No Gulf View if it is located on the bay or a golf course (near but not on the Gulf). Sample data from the Multiple Listing Service in Naples, Florida, provided sales data for 40 Gulf View condominiums and 18 No Gulf View condominiums. The complete data set is in the file named Real Estate, linked at the bottom of the page.Managerial ReportPrepare a report (see below) that summarizes your assessment of the nature of the housing market in southwest Florida. Be sure to include the following seven (7) items in your report.Descriptive statistics (mean, median, range, and standard deviation) to summarize each of the three variables for the 40 Gulf View condominiums. Are there any outliers in the data set for any of the three variables? If there are any outliers in any category, please list them and state for which category they are an outlier. Describe which method you used to make your determination.Descriptive statistics (mean, median, range, and standard deviation) to summarize each of the three variables for the 18 No Gulf View condominiums. Are there any outliers in the data set for any of the three variables? If there are any outliers in any category, please list them and state for which category they are an outlier. Describe which method you used to make your determination.Compare your summary results from #1 and #2. Discuss any specific statistical results that would help a real estate agent understand the condominium market.Develop a 95% confidence interval estimate of the population mean sales price and population mean number of days to sell for Gulf View condominiums. Interpret your results.Develop a 95% confidence interval estimate of the population mean sales price and population mean number of days to sell for No Gulf View condominiums. Interpret your results.Assume the branch manager requested estimates of the mean selling price of Gulf View condominiums with a margin of error of $40,000 and the mean selling price of No Gulf View condominiums with a margin of error of $15,000. Using 95% confidence, how large should the sample sizes be for each?Gulf Real Estate Properties just signed contracts for two new listings: a Gulf View condominium with a list price of $589,000 and a No Gulf View condominium with a list price of $285,000. What is your estimate of the final selling price (based on the percent difference for the sale and list price) and number of days required to sell each of these units?Write a report that adheres to the Written Assignment Requirements under the heading “Expectations for CSU-Global Written Assignments” found in the CSU-Global Guide to Writing and APA Requirements. As with all written assignments at CSU-Global, you should have in-text citations and a reference page. An example paper is provided in the MTH410 Guide to Writing with Statistics, linked at the bottom of the page.Your report must contain the following:A title page in APA style.An introduction that summarizes the problem.The body of the paper should answer the questions posed in the problem by communicating the results of your analysis. Include results of calculations, as well as charts and graphs, where appropriate.A conclusion paragraph that addresses your findings and what you have determined from the data and your analysis. Submit your Excel file in addition to your report.
GCU Effectiveness of Sampling Method Discussion
Select a research article, other than the articles from your assignments, from the GCU library. Provide an overview of the ...
GCU Effectiveness of Sampling Method Discussion
Select a research article, other than the articles from your assignments, from the GCU library. Provide an overview of the study and describe the strategy that was used to select the sample from the population. Evaluate the effectiveness of the sampling method selected. Provide support for your answer. Include the article title and permalink in your post.
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(Round your answer to the nearest whole number.)
A grey squirrel population was introduced in a certain county of Great Britain 35 years ago. Biologists observe ...
(Round your answer to the nearest whole number.)
A grey squirrel population was introduced in a certain county of Great Britain 35 years ago. Biologists observe that the population doubles every 7 years, and now the population is 80,000.Estimate the squirrel population 10 years from now.
Review t test and ANOVA
Part A. Dependent t testIn this assignment, we are interested in finding out whether participation in a creative writing c ...
Review t test and ANOVA
Part A. Dependent t testIn this assignment, we are interested in finding out whether participation in a creative writing course results in increased scores of a creativity assessment. For this part of the assignment, you will be using the data file “Activity 8a.sav”. In this file, “Participant” is the numeric student identifier, “CreativityPre” contains creativity pre-test scores, and “CreativityPost” contains creativity post-test scores. A total of 40 students completed the pre-test, took the creativity course, and then took the post-test.Exploratory Data Analysis/Hypotheses.Perform exploratory data analysis on CreativityPre and CreativityPost. Using SPSS, calculate the mean and standard deviation of these two variables.Construct an appropriate chart/graph that displays the relevant information for these two variables.Write the null and alternative hypotheses used to test the question above (e.g., whether participation in the course affects writing scores).Comparison of MeansPerform a dependent t test to assess your hypotheses above (note that many versions of SPSS use the term “paired samples t test” rather than dependent t test; the test itself is the same.Write one or two paragraphs that describe the dataset, gives your hypothesis, and presents the results of the dependent sample t test. Be sure that your writing conforms to APA style.Part B. Independent t testIn this assignment, we will start with the data file used in Part A (“Activity 6a.sav”). Suppose, however, you [the researcher] encountered a small problem during data collection: after the post-tests were collected, you realized that the post-test form did not ask for the students’ identification number. As such, it will be impossible to match pre-test scores to post-test scores. Rather than simply give up, you start thinking about the data you do have, and try to determine whether you can salvage your project. In assessing the situation, you realize that you have 40 pre-test scores and 40 post-test scores, but no way to link them. While it will result in a weaker comparison, you determine that you are still able to compare pre-test vs. post-test scores; you will use a between-subjects design rather than a within-subjects design.Create the data set.Using the “Activity 8a.sav” file as a starting point, create a new dataset that you can use with the between subjects design. Hint: you will no longer need the variables CreativePre and CreativeTest. Instead, you have only one variable for the score on the creativity test. A second (or grouping) variable will serve to indicate which test the student took.Submit the dataset as one of the week’s files. Name the file in the following format: lastnamefirstinitialPSY7107-8b.sav (example: smithbPSY7107-8b.sav).Exploratory Data Analysis/Hypotheses.Comparison of MeansPerform an independent t test to assess your hypotheses above (note that many versions of SPSS use the term “independent samples t test” rather than simply “independent t test”.Write one or two paragraphs that describe the dataset, gives your hypothesis, and presents the results of the dependent sample t test. Be sure that your writing conforms to APA style.Comparison of DesignsIn this assignment, you used the same dataset to analyze both a between- and within-subjects design. Create a single paragraph (using the material you wrote above), that presents both sets of results.Explain, in 300-500 words, whether the two tests resulted in the same findings. Did you expect this to be the case? Why or why not? What have you learned in this assignment?Part C. ANOVAAll of us have had our blood pressure measured while at our physician’s office. How accurate are these measurements? It may surprise you to learn that there is something called “white coat syndrome”—the tendency of some people to exhibit elevated blood pressure in clinical (medical) settings only. In other words, for these people the very fact that the physician is taking their blood pressure causes it to increase (for more information about white coat syndrome see http://www.webmd.com/anxiety-panic/features/beyond-white-coat-syndrome ). In this assignment, you will be using the “Activity 8c.sav” data file to determine whether you find support for the existence of white coat syndrome. In this study, 60 participants were randomly assigned to one of three groups. The “settings” variable indicates the location in which the participants’ blood pressure was recorded: 1=home, 2=in a doctor’s office, and 3=in a classroom setting. The “SystolicBP” variable contains the participants’ systolic pressure (the “upper” number). The “DiastolicBP” variable contains the participant’s diastolic pressure (the “lower” number).Exploratory Data Analysis/Hypotheses.Perform exploratory data analysis on both the SystolicBP and DiastolicBP variables. Using SPSS, calculate the mean and standard deviation of these two variables. Be sure that your analysis is broken down by setting (e.g., you will have six means, six SD’s, etc.).Create two graphs—one for systolic and one for diastolic pressure. Each graph should clearly delineate the three groups.Write a null and alternative hypothesis for the comparison of the three groups (note that your hypothesis will state that the three groups are equivalent; be sure to word your null hypothesis correctly).ANOVA.Using the “Activity 8c.sav” data file, perform two single factor ANOVAs: one using SystolicBP and one using DiastolicBP as the dependent variable.If appropriate for either or both of the ANOVAs, perform post hoc analyses to determine which groups actually differ.Write one paragraph for each ANOVA (be sure to use APA style). At a minimum, each paragraph should contain the three means, three SD’s, ANOVA results (F, df), post hoc tests (if applicable), effect size, and an interpretation of these results.Save and name your Word document in the following format: lastnamefirstinitialPSY7107-8.docYou should now have the following files:lastnamefirstinitialPSY7107-8b.sav (example: smithbPSY7107-8b.sav)lastnamefirstinitialPSY7107-8.doc
PUBH 8500 WU WK 10 Numeric Descriptive Statistics Census Region Analysis
Assignment: The Effect of Weights
“The use of sampling weights and sample design variables is recommended for all analys ...
PUBH 8500 WU WK 10 Numeric Descriptive Statistics Census Region Analysis
Assignment: The Effect of Weights
“The use of sampling weights and sample design variables is recommended for all analyses because the sample design is a clustered design and incorporates differential probabilities of selection. If you fail to account for the sampling parameters, you may obtain biased estimates and overstate significance levels.”
In other words, samples selected for surveys may have imperfections in their representation of the reference population. Imperfections include the selection of sampling unit with unequal probability, non-coverage of the population, and non-responses to survey questions. Sampling weights would be used to compensate for these imperfections and produce valid and reliable results.
For this Assignment, you analyze the relationship of two variables with logistic regression, using both weighted and unweighted data. You then compare the results to identify the effect of weighting on the interpretation of the relationship.
The Assignment
Examine the Data (30 Points)
Open the Week 10 Dataset (SPSS document) located in the Learning Resources area.
Produce numeric descriptive statistics for the following variables:
Cregion
USR
Sex
Q1
Q6a
Q16
Q22a
Receduc
Race/Ethnicity
Logistic Regression
Use SPSS to run a logistic regression model with Q22a. “Have you ever looked online for -- Information about a specific disease or medical problem?” as your dependent variable (Note that there are 4 levels of responses possible, but only 2 are actually used in the responses so you can state the dependent variable is a binomial and use binary logistic regression) and Sex as the independent variable.
Use backwards stepwise regression to add Receduc to the model as a potential confounder.
How does the relationship between Q22a and Sex change with the addition of Receduc? Include a discussion of Odds Ratios and the Model Summary in your answer. Would you consider Receduc a confounder? Is it worth keeping it in the model even if it does not coufound the relationship between Q22a and Sex in this sample?
Logistic Regression with weights
Weight cases using the variable standwt (Standardized weight)
Use SPSS to rerun a logistic regression model with Q22a. “Have you ever looked online for -- Information about a specific disease or medical problem?” as your dependent variable, Sex as the independent variable, and Receduc as a covariate.
How does weighting the cases change the outcome of the logistic regression?
Discuss why it is important to weight cases from surveys with complex sampling schemes using the differing outcomes you have from parts 2 and 3 of this assignment.
Gulf Real Estate Properties
Gulf Real Estate Properties, Inc. is a real estate firm located in southwest Florida. The company, which advertises itself ...
Gulf Real Estate Properties
Gulf Real Estate Properties, Inc. is a real estate firm located in southwest Florida. The company, which advertises itself as an “expert in the real estate market,” monitors condominium sales by collecting data on location, list price, sale price, and the number of days it takes to sell each unit. Each condominium is classified as Gulf View if it is located directly on the Gulf of Mexico, or No Gulf View if it is located on the bay or a golf course (near but not on the Gulf). Sample data from the Multiple Listing Service in Naples, Florida, provided sales data for 40 Gulf View condominiums and 18 No Gulf View condominiums. The complete data set is in the file named Real Estate, linked at the bottom of the page.Managerial ReportPrepare a report (see below) that summarizes your assessment of the nature of the housing market in southwest Florida. Be sure to include the following seven (7) items in your report.Descriptive statistics (mean, median, range, and standard deviation) to summarize each of the three variables for the 40 Gulf View condominiums. Are there any outliers in the data set for any of the three variables? If there are any outliers in any category, please list them and state for which category they are an outlier. Describe which method you used to make your determination.Descriptive statistics (mean, median, range, and standard deviation) to summarize each of the three variables for the 18 No Gulf View condominiums. Are there any outliers in the data set for any of the three variables? If there are any outliers in any category, please list them and state for which category they are an outlier. Describe which method you used to make your determination.Compare your summary results from #1 and #2. Discuss any specific statistical results that would help a real estate agent understand the condominium market.Develop a 95% confidence interval estimate of the population mean sales price and population mean number of days to sell for Gulf View condominiums. Interpret your results.Develop a 95% confidence interval estimate of the population mean sales price and population mean number of days to sell for No Gulf View condominiums. Interpret your results.Assume the branch manager requested estimates of the mean selling price of Gulf View condominiums with a margin of error of $40,000 and the mean selling price of No Gulf View condominiums with a margin of error of $15,000. Using 95% confidence, how large should the sample sizes be for each?Gulf Real Estate Properties just signed contracts for two new listings: a Gulf View condominium with a list price of $589,000 and a No Gulf View condominium with a list price of $285,000. What is your estimate of the final selling price (based on the percent difference for the sale and list price) and number of days required to sell each of these units?Write a report that adheres to the Written Assignment Requirements under the heading “Expectations for CSU-Global Written Assignments” found in the CSU-Global Guide to Writing and APA Requirements. As with all written assignments at CSU-Global, you should have in-text citations and a reference page. An example paper is provided in the MTH410 Guide to Writing with Statistics, linked at the bottom of the page.Your report must contain the following:A title page in APA style.An introduction that summarizes the problem.The body of the paper should answer the questions posed in the problem by communicating the results of your analysis. Include results of calculations, as well as charts and graphs, where appropriate.A conclusion paragraph that addresses your findings and what you have determined from the data and your analysis. Submit your Excel file in addition to your report.
GCU Effectiveness of Sampling Method Discussion
Select a research article, other than the articles from your assignments, from the GCU library. Provide an overview of the ...
GCU Effectiveness of Sampling Method Discussion
Select a research article, other than the articles from your assignments, from the GCU library. Provide an overview of the study and describe the strategy that was used to select the sample from the population. Evaluate the effectiveness of the sampling method selected. Provide support for your answer. Include the article title and permalink in your post.
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