I did part 1 already, which is below part 2.

Part 2- Use the mean and the standard deviation obtained from the last module and test the claim that the mean age of all books in the library is greater than 2005. Share your results with the class.

The mean that I have is 16.88

Go to a local library; collect a sample of books consisting of the ages of book (based on copyright dates). Plan and describe the sampling procedure, then use the results to construct a confidence interval estimate of the mean age of all books in the library.

The sampling procedure that I used was a stratified random sample.I randomly selected 5 types of books which are comics, Action and Adventure, Classics, Mystery, and Fantasy. For each of the book types, I randomly selected 5 books. Since the confidence level is not mentioned then I would consider it as 95% or 0.95. The estimate of the mean age of all books in the library is 16.88. Below is the data of ages of books.

67

25

8

2

25

12

1

9

12

6

68

10

15

16

3

3

45

6

5

45

31

9

13

7

10