Provide an appropriate response.Compute the coefficient of correlation, r, letting Row 1 represent the x-values and Row 2 represent the y-values. Then, compute the coefficient of correlation, r, letting Row 2 represent the x-values and Row 1 represent the y-values. What effect does switching the explanatory and response variables have on the linear correlation coefficient? ___________________________________________________________________________________________

The following data represents the number of cars that arrived at McDonald’s drive thru between 11.50 am to 12 noon each Wednesday for the past 50 weeks. 1 7 3 8 2 3 8 2 6 3 6 5 6 4 3 4 3 8 1 2 5 3 6 3 3 4 3 2 1 2 4 4 9 3 5 2 3 5 5 5 2 5 6 1 7 1 5 3 8 4 a) Construct a frequency distribution for the data. b) Construct a relative frequency distribution of the data c) Construct a histogram of the data. Describe the shape of the distribution [1] d) What percentage of weeks did exactly 3 cars arrive between 11.50 and 12 noon? [2] % e) What percentage of weeks did 3  or more cars arrive between 11.50 and 12 noon? [3] %  

Upload a scan of your ORGANIZED work page for the FREE RESPONSE questions of this exam. Upload as a JPG, PNG, PDF or DOCX file.

Calculate each student’s z-score. Show your work and round to two decimal places.

Which company has more consistent delivery times within the middle 50% of its deliveries? Support your answer using both IQRs.

A college surveyed students about their employment status and preferred class format. Percentages are calculated within each row. Contingency Table of Employment Status and Course Preference Employment status Prefer online classes Prefer in-person classes Total Employed 65% 35% 100% Not employed 40% 60% 100% Which statement is best supported by the table?

Which measure of center would be most appropriate to report for a typical student?

Identify the outlier’s company and delivery time. Explain what this observation represents in context.

Researchers are investigating whether exposure to violent video games increases aggressive behavior.  However, they fail to control for prior history of aggressive behavior.  In this study, prior history of aggressive behavior is potentially a(n) ___________.

Mark the cutoff on your sketch and shade the region representing the longest-lasting 10%. Explain what the cutoff means in terms of component lifetimes.