Work Sheet week 1, math homework help

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Practice Set 1 QNT/275 Version 6 University of Phoenix Material Practice Set 1 Practice Set 1 1. The following table lists the number of deaths by cause as reported by the Centers for Disease Control and Prevention on February 6, 2015: Cause of Death Heart disease Cancer Accidents Stroke Alzheimer's disease Diabetes Influenza and Pneumonia Suicide Number of Deaths 611,105 584,881 130,557 128,978 84,767 75,578 56,979 41,149 a) What is the variable for this data set (use words)? The number of deaths b) How many observations are in this data set (numeral)? c) How many elements does this data set contain (numeral)? 2. Indicate which of the following variables are quantitative and which are qualitative. Note: Spell quantitative and qualitative in lower case letters. a) The amount of time a student spent studying for an exam b) The amount of rain last year in 30 cities c) The arrival status of an airline flight (early, on time, late, canceled) at an airport qualitative d) A person's blood type e) The amount of gasoline put into a car at a gas station 3. A local gas station collected data from the day's receipts, recording the gallons of gasoline each customer purchased. The following table lists the frequency distribution of the gallons of gas purchased by all customers on this one day at this gas station. Gallons of Gas 4 to less than 8 8 to less than 12 Number of Customers 78 49 Copyright © 2017 by University of Phoenix. All rights reserved. 1 Practice Set 1 QNT/275 Version 6 12 to less than 16 16 to less than 20 20 to less than 24 81 117 13 a) How many customers were served on this day at this gas station? 338 b) Find the class midpoints. Do all of the classes have the same width? If so, what is this width? If not, what are the different class widths? c) What percentage of the customers purchased between 4 and 12 gallons? (do not include % sign. Round numerical value to one decimal place) 4. The following data give the one-way commuting times (in minutes) from home to work for a random sample of 50 workers. 23 17 34 26 18 33 46 42 12 37 44 15 22 19 28 32 18 39 40 48 16 11 9 24 18 26 31 7 30 15 18 22 29 32 30 21 19 14 26 37 25 36 23 39 42 46 29 17 24 31 a. What is the frequency for each class 0–9, 10–19, 20–29, 30–39, and 40–49. b. Calculate the relative frequency and percentage for each class. c. What percentage of the workers in this sample commute for 30 minutes or more? Note: Round relative frequency to two decimal places. Complete the table by calculating the frequency, relative frequency, and percentage. Commuting Frequency Relative Percentage Times (part a) Frequency (%) (part c) (part d) 0-9 ? 0.?? ? 10-19 ? 0.?? ? 20-29 ? 0.?? ? 30-39 ? 0.?? ? 40-49 ? 0.?? ? 5. The following data give the number of text messages sent on 40 randomly selected days during 2015 by a high school student. 32 33 33 34 35 36 37 37 37 37 38 39 40 41 41 42 42 42 43 44 44 45 45 45 47 47 47 47 47 48 48 49 50 50 51 52 53 54 59 61 Copyright © 2017 by University of Phoenix. All rights reserved. 2 Practice Set 1 QNT/275 Version 6 Each stem has been displayed (left column). Complete this stem-and-leaf display for these data. Note: Use a space in between each leaf. For example 1 2 3 4 5 6 7 8 9 (do not use this format 123456789). 3 ?... 4 ?... 5 ?... 6 ?... 6 A) Which of the five measures of center (the mean, the median, the trimmed mean, the weighted mean, and the mode) can be calculated for quantitative data only. B) Which can be calculated for both quantitative and qualitative data? 7. Prices of cars have a distribution that is skewed to the right with outliers in the right tail. Which of the measures of center is the best to summarize this data set? 8. The following data give the amounts (in dollars) of electric bills for November 2015 for 12 randomly selected households selected from a small town. 205 265 176 314 243 192 297 357 238 281 342 259 Calculate the (a) mean, (b) median and (c) Is there a mode (Yes or No)? 9. The following data give the prices of seven textbooks randomly selected from a university bookstore. $89 $170 $104 $113 $56 $161 $147 a) Find the mean for these data (input the numerical value without the dollar sign). Calculate the deviations of the data values from the mean. b) Is the sum of these deviations zero (yes or no)? c) Calculate the range (do not include unit). d) Calculate the variance. e) Calculate the standard deviation (round to one decimal place). 10. The following data give the speeds of 13 cars (in mph) measured by radar, traveling on I-84. 73 75 69 68 78 69 74 76 72 79 68 77 71 a) Find the values of the three quartiles and the interquartile range. Copyright © 2017 by University of Phoenix. All rights reserved. 3 Practice Set 1 QNT/275 Version 6 b) Calculate the (approximate) value of the 35th percentile (round to two decimal places). c) Compute the percentile rank of 71 (round to two decimal places. Do not include the % symbol). Note: Round to two decimal places. Do not include unit. Copyright © 2017 by University of Phoenix. All rights reserved. 4
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Question 1
a) What is the variable for this data set (use words)? The number of deaths
Cause of death is the independent variable
b) How many observations are in thi...


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