Question

3. [16] In order to measure the effect of a storewide sales campaign on nonsale items, the research director of national supermarket chain took a random sample of 13 pairs of stores that were matched according to average weekly sales volume. One store of each pair (the experimental group) was exposed to the sales campaign, and the other member of the pair (the control group) was not. The data over a weekly period are provided in the file SALESCMP.xlxs. a. [12] At the .05 significance, can the research director conclude that there is evidence the sales campaign has increased the average sales of nonsale items? b. [2] What assumption is necessary to perform this test? c. [2] Find the p-value in (a) and interpret its meaning.

Answer 1

salutions The effect of the store wide sales nonsake items campaign Mean sales Se 62.85 with campaign without campaign -nean saks one = 59.19 To check weather Mc > Hinc nu!! Huqo thesis Ho: Mc > Inc. a To prove lets look at confidence intervel Significance of nc ate at 5% 19.49 59.19 + 1.96 X vis Standard deviation 19:49 and Z = 1.96 and n.13 tis 6.69.46] non campagin can Since the mean for be grater than 62.85

we can't include rejects the null bypothesis, The assumption necessary to perform this is the random scumple and representative of population. caboubting G-value using z-score 7 -(59-19 -6985 19.49 .0-18747 using Z table to calculate p-vale we get -0.86 This p-value is not significant. (less than 0.05 .