Assistance needed for step by step

A student group at a university in the Midwest is conducting a study to determine whether there is a difference between textbook prices for used textbooks sold by the on a campus bookstore and by an Internet retailer. A random sample of 10 textbooks was taken, and the campus price and the Internet retailer's price for each textbook were collected. At the 0.01 level of significance, can the student group conclude that there is a difference in average textbook prices for used textbooks sold on campus and over the internet?

Textbook: Physics Chemistry Spanish Accounting Calculus

Campus: $108 $114 $114 $110 $118

Internet: $124 $120 $107 $112 $122

Textbook: Economics Art Biology History English

Campus $108 $119 $115 $119 $114

Internet $123 $125 $108 $117 $119

2nd

Allstate insurance is one of the major automobile insurance companies in the country. Thewestern region claims manager instructed an intern in her department to develop a confidence interval estimate of the difference between the mean years that male customers have been insured by Allstate versus female customers. The intern randomlyselected 13 male and 13 female customers from the account records and recorded the number of years that each customer had been insured by Allstate. These data (rounded to the nearest year) are as follows:

Males

149916

1481211

69107

3

Females

31047

10541

4469

2

Based on these data, construct and interpret a 90% confidence interval estimate for the difference between the mean years for male and female customers. Assume equal population variances.