hi, can anyone help me answer this. tq

b. The librarian at the local elementary school claims that on average, the books in the library are more than 20 years old. To test his claim, a student takes a sample of 15 books and records the publication date for each. The sample produces an average age of 23.8 years with a variance of 67.5. i. Conduct an appropriate statistical test in order to test the librarian claim at 5% level of significance. (10 marks) ii. Construct a 95% confidence interval to estimate the average year of books