Skip to Main Content Español

Topic 6 Homework (Nonadaptive) Question 7 of 11 (1 point)|Question Attempt: 1 of Unlimited

1 2 3 4 5 6 7 8 9 10 11 Question 7 The owner of a chain of mini-markets wants to compare the sales performance of two of her stores, Store 1 and Store 2. After choosing 12 days at random, she records the sales (in dollars) at Store 1 for these days. Then, she records the sales at Store 2 for these same days. The data and the differences (Store 1 minus Store 2) are shown in the table below. Day 1 2 3 4 5 6 7 8 9 10 11 12 Store 1 955 552 442 687 552 729 488 776 461 815 859 518 Store 2 989 599 500 680 451 528 452 741 446 758 960 421 Difference (Store 1 − Store 2) −34 −47 −58 7 101 201 36 35 15 57 −101 97

Send data to calculator

Assume that the population of these differences in daily sales (Store 1 minus Store 2) is approximately normally distributed.

Construct a 95% confidence interval for μd, the population mean difference in daily sales between the two stores. Then find the lower and upper limits of the 95% confidence interval. Carry your intermediate computations to three or more decimal places. Round your answers to two or more decimal places. (If necessary, consult a list of formulas.) Lower limit: Upper limit:

Check

Save For Later

Submit Assignment © 2024 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility Clears your work. Undoes your last action.