Solve the following:
Q: What is the average difference between the price of name-brand soup and the price of store-brand soup? To obtain an estimate, an analyst randomly samples eight stores. Each store sells its own brand and a national name brand. The prices of a can of name-brand tomato soup and a can of the store-brand tomato soup follow.
Store Name brand Store brand
1 54c 49c
2 55 50
3 59 52
4 53 51
5 54 50
6 61 56
7 51 47
8 53 49Construct a 90% confidence interval to estimate the average difference. Assume that the differences in prices of tomato soup are normally distributed in the population