STATS homework 2

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MATH 302
Aug 21, 2023
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STATS HOMEWORK 2 Question 1: Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follows: See Attached Excel for Data. movie data.xlsx Find the sample mean. Round to two decimal places. Use the Excel function to find the Average. ANSWER: 1.48 Question 2: Cholesterol levels were collected from patients two days after they had a heart attack (Ryan, Joiner & Ryan, Jr, 1985). Find the standard deviation. Use the Excel function to find the Sample SD. See Attached Excel for Data. cholesterol data.xlsx ANSWER: 47.71 45.76 47.71 2195 46.85 9.02 2276.29 Question 3
Suppose that a manager wants to test two new training programs. They randomly select 5 people for each training type and measure the time it takes to complete a task after the training. The times for both trainings are in the attached Excel file. Which training method is more variable? training data.xlsx ANSWER: training 1 Training 1 Training 2 They have the same mean so the variability is the same. Question 4 Enter your responses in the two blank spaces below. The box plot shows weights of all team members of a football team. The middle 50% of the weights for the box plot are from to Round to 1 decimal place. ANSWER: 205.5 to 272.5 Question 5 Which of the following statements are false regarding a boxplot? ANSWER: The length of the box equals the range of the data.
The height of the box has no significance. Boxplots can be used to either describe a single variable in a data set or to compare two (or more) variables The right and left of the box are the third and first quartiles The length of the box equals the range of the data. Question 6 Sixty-five randomly selected car salespersons were asked the number of cars they generally sell in one week. Fourteen people answered that they generally sell three cars; nineteen generally sell four cars; twelve generally sell five cars; nine generally sell six cars; eleven generally sell seven cars. Complete the table. If the answer is a whole number leave whole otherwise, round your answers to one decimal place. Data Value (# cars) Frequency Relative Frequency Percent Cumulative Frequency 3 14 (a) % 14 4 (b) 29.2% (c) 5 12 18.46% 45 (d) (e) 13.8% 54 7 11 16.9% 65 ANSWER: (a): 21.5 % (b):19 (c): 33 (d): 6 (e): 9 Question 7
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