Statistics Problems Project

User Generated

NGF9

Mathematics

Description

Solve all 14 questions on the answer sheets. Must be accurate in order to get full credit.

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Copyright © 2019, Udaptive. All Rights Reserved. How to enable Macros FaQ What will be considered for grading? Only "Answer" Sheets will be considered for grading. Can I add additional worksheets? Yes. What is the best way to present my solution? Complete your work in your worksheet and reference or "hardcode" your answer in the yellow cells provided in the "Answer" sheet. Why is my formula not working in Excel? Check for Automatic Calculation. On the Formulas ribbon [Excel Opions], look to the far right and click Calculation Options. When this option is set to automatic, Excel recalculates the spreadsheet's formulas whenever you change a cell value. Terms of Use This template is considered a copyrighted work under the Unites States and other copyright laws and is the property of Udaptive. The items listed below are additional points to help clarify how you may use this template. Not for Resale or Public Sharing You may make archival copies and customize this template only for your personal use and not for resale sharing. or public You may not remove or alter any logo, trademark, copyright, disclaimer, brand, terms of use, attribution, or other proprietary notices or marks within this template. This template and any customized or modified version of this template may NOT be sold, distributed, published to an online gallery, hosted on a website, or placed on a public server. Disclaimer This template is provided for informational or educational use only and is not intended to be relied on as medical, financial, legal, or other professional advice. Udaptive makes no guarantee or representations about this template, or the accuracy or completeness of the content contained within this template. Location (saved) User_ID AnswerSheets Course 2 Please answer all questions based on the data provided below and 'Dataset1'. If you cannot answer the question due to 'NA'. Do not change the formatting of the yellow cells. Round to four digits after decimal. 1) According to the central limit theorem, for samples of size 55 drawn from a population with μ = 800 and σ = 56, the st sampling distribution of sample means would equal: answer 2) Suppose a population has a mean of 400 and a standard deviation of 24. If a random sample of size 97 is drawn from probability of drawing a sample with a mean between 401 and 404.5 is: answer 3) The z value associated with a two-sided 94% confidence interval is: answer 4) The table t value associated with the upper 2.5% of the t distribution and 12 degrees of freedom is: answer Suppose a researcher is interested in understanding the variation in the price of store brand milk. A random sample o 5) from a population and the mean price of store brand milk is calculated. The sample mean is $7.60 with a standard de 92% confidence interval to estimate the population mean. lower upper answer Life tests performed on a sample of 13 batteries of a new model indicated: (1) an average life of 75 months, and (2) a 6) months. Other battery models, produced by similar processes, have normally distributed life spans. The 90% confiden population mean life of the new model is: lower upper answer A researcher is interested in estimating the mean weight of a semi tracker truck to determine the potential load capa 7) sample of 13 trucks and computes a sample mean of 20,000 pounds with sample standard deviation of 1,500. She dec confidence interval to estimate the mean. The degrees of freedom associated with this problem are: answer you cannot answer the question due to insufficient data, enter decimal. population with μ = 800 and σ = 56, the standard deviation of the random sample of size 97 is drawn from the population, the degrees of freedom is: e of store brand milk. A random sample of 36 grocery stores selected ample mean is $7.60 with a standard deviation of $0.23. Construct a 1) an average life of 75 months, and (2) a standard deviation of 9 y distributed life spans. The 90% confidence interval for the uck to determine the potential load capacity. She takes a random mple standard deviation of 1,500. She decides to construct a 98% d with this problem are: Dataset1 No additional data Please answer all questions based on the data provided below and 'Dataset2'. If you cannot answer the question due to yellow cells. Round to four digits after decimal. 1) Bruce Tay, intern at Mark-Analytics, is conducting a study in which a population mean will be estimated using a 92% c population mean. The population standard deviation is estimated to be around 60. The necessary sample size should answer 2) The weights of aluminum castings produced by a process are normally distributed. A random sample of 6 castings is s deviation is 0.12 pound. The 98% confidence interval for the population mean casting weight is: lower upper answer 3) You are evaluating the service level provided to walk-in customers. Accordingly, you recorded the waiting times for 6 waiting time was 14 minutes. Assume that the population standard deviation is 4 minutes. The 90% confidence interv lower upper answer 4) A researcher wants to determine the sample size necessary to adequately conduct a study to estimate the population use a 90% level of confidence. The sample size should be at least (round up!): answer 5) The p-value is: answer The customer help center in your company receives calls from customers who need help with some of the customized average waiting time is 7 minutes at the busiest time, from 8 a.m. to 10 a.m., Monday through Thursday. One of your 6) busy hours, the waiting time exceeds 7 minutes. You conduct a statistical study to determine the average waiting tim minutes. If the population standard deviation is known to be 4.2 minutes, and α = 0.05, the p-value is approximately: answer After several semesters of research you finally decided to launch your own product idea online. According to your we You believe an increase of the average-time-spend will increase your profits. Therefore, you decided to hire a fellow 7) appropriate statistical test, and develop the decision rule to determine if your classmate adds value to your website g level of 90%. answer because nnot answer the question due to insufficient data, enter 'NA'. Do not change the formatting of the an will be estimated using a 92% confidence interval. The estimate needs to be within 10 of the actual The necessary sample size should be at least (round up!): A random sample of 6 castings is selected; the sample mean weight is 3.47 pounds; and the sample standard ng weight is: u recorded the waiting times for 64 randomly selected walk-in customers and determined that their mean inutes. The 90% confidence interval for the population mean of waiting times is: study to estimate the population mean to within 4 points. The σ of population is 25 and the researcher plans to help with some of the customized software solutions your company provides. Your company claims that the ay through Thursday. One of your main clients has recently complained that every time she calls during the etermine the average waiting time with a sample of 35 calls for which you obtain an average waiting time of 8.2 .05, the p-value is approximately: idea online. According to your web hosting service, your clients spend about 14 minutes/week on your website. ore, you decided to hire a fellow student to help you with your website. Formulate your hypothesis, identify the mate adds value to your website given the following data: sample size: 114, x̄: 14.3, σ: 4.6, and a confidence Dataset2 No additional data
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Explanation & Answer

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Copyright © 2019, Udaptive.
All Rights Reserved.

How to enable Macros

FaQ
What will be considered for grading?
Only "Answer" Sheets will be considered for grading.
Can I add additional worksheets?
Yes.
What is the best way to present my solution?
Complete your work in your worksheet and reference or "hardcode" your answer in the yellow
cells provided in the "Answer" sheet.
Why is my formula not working in Excel?
Check for Automatic Calculation. On the Formulas ribbon [Excel Opions], look to the far right
and click Calculation Options. When this option is set to automatic, Excel recalculates the
spreadsheet's formulas whenever you change a cell value.

Terms of Use
This template is considered a copyrighted work under the Unites States and other copyright laws and
is the
property
of Udaptive. The items listed below are additional points to help clarify how you may use this template.
Not for Resale or Public Sharing
You may make archival copies and customize this template only for your personal use and not for
resale sharing.
or
public
You may not remove or alter any logo, trademark, copyright, disclaimer, brand, terms of use,
attribution, or other proprietary notices or marks within this template.

This template and any customized or modified version of this template may NOT be sold, distributed,
published to an online gallery, hosted on a website, or placed on a public server.

Disclaimer
This template is provided for informational or educational use only and is not intended to be relied on as medical,
financial, legal, or other professional advice.
Udaptive makes no guarantee or representations about this template, or the accuracy or completeness of the
content contained within this template.

Location (saved)
User_ID
AnswerSheets
Course

2

Please answer all questions based on the data provided below and 'Dataset1'. If you cannot answer the question due to
enter 'NA'. Do...


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