Walmart Problem&Key.pdf

# They will have to pay out more money for the workers

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On the same days of the previous problem, Walmart will need to hire extra staff to man the checkout lanes. They will have to pay out more money for the workers. The chart below describes how much money in pay it paid out during those hours on these specific days. Date 11/22 11/23 11/29 11/30 12/6 12/7 12/14 12/15 12/21 12/22 12/29 12/30 Weather Sun Cloudy Sun Rain Sun Sun Cloudy Cloudy Cloudy Rain Snow Sun Lanes 5 12 11 7 12 8 6 10 8 6 4 8 Avg Wait Time (Min) 12.2 4.2 4.4 6.75 3.8 5.75 10.4 6.5 6.25 9.2 1.1 5.6 Salary for extra staff \$213 \$451 \$444 \$256 \$498 \$301 \$229 \$364 \$291 \$253 xxxx \$320 19. What is the explanatory variable? _________________ What is the response variable _____________. 20. For answer # 19, make a scatterplot on your calculator and draw it below. 21. Generate the least squares regression line that describes the data and draw it on the graph above. 2 dec places) _______________________________________________ 22. Give the meaning of the slope in the LSRL. ___________________________________________ 23. What specific point is the LSRL guaranteed to go through? ______________ 24. Describe the data in terms of form, direction, and strength. ________________________________ ________________________________________________________________________ 25. Find the value of r . ________ Interpret it. ___________________________________________ 26. Find the value of r 2 . ________ Interpret it. ________________________________________ 27. What is the predicted extra salary if Walmart opens 9 lanes? _________ 28. What is the predicted extra salary if Walmart opens 7 lanes? _________ 29. What is the difference between the actual extra salary and predicted extra salary for 7 lanes? ______ 30. If Walmart will pay no more than \$500 in extra salary, find the maximum lanes it can open.______ 31. If Walmart will pay no more than \$250 in extra salary, how the maximum lanes it can open. ______ 32. What is the predicted extra salary if Walmart opens no lanes? _______ 33. What is the predicted extra salary if Walmart opens 50 lanes? _______ 34. Why do the last two problems and answers make little sense for this problem? ________________ _______________________________________________________________________________ 35. A Walmart manager needs to decide how many lanes to open. Based on the data of the and the previous page, explain the dilemma he has in making a decision. _______________________________________________________________________________ _______________________________________________________________________________

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Stu Schwartz A.P. Statistics – Linear Regression Worksheet - Solutions The busiest season for Walmart is the Christmas holiday and weekends see a tremendous number of customers. Last year, Walmart conducted a study as to the amount of waiting in time in checkout lanes its customers had to wait. On Saturdays and Sundays of its holiday season, it opened a different number of checkout lanes for customers between 1 PM and 4 PM, its busiest times. The measurement was the average wait time for a customer to go through the lane and complete the transaction. A different number of lanes was opened each day.
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