Retailers often become competitive during the back-to-school sale time. The date below and in the spreadsheet were extracted from advertising brochures circulated by Coles and Woolworths in the Sydney metropolitan area during the first week of January 2006.

Stationery Item Coles Woolworths

64-page exercise book $0.05 $0.05

96-page exercise book $0.10 $0.09

128-page exercise book $0.15 $0.15

A4 lever arch folder $0.59 $0.52

A4 20-pocket display book $0.46 $0.52

A4 5-tab subject dividers $0.33 $0.34

A4 2-ring binder $1.69 $1.49

24-pk colour pencils $1.26 $1.26

30-cm plastic ruler $0.28 $0.29

1mx45cm movie log book cover $1.69 $1.28

9-piece geometry set $1.49 $1.49

100 A4 sheet protectors $1.49 $1.93

64-page binder book $0.34 $0.29

96-page binder book $0.38 $0.35

a. Using an appropriate test and a 1% level of significance, examine whether there was a significant difference between the mean price of Stationery at coles and Woolworths in Sydney in the relevant week.

b. Assuming a two-tail test is used, calculate the p-value and interpret it.

Use of excel would be better :)) Thank you soo much.