Question

A librarian of a school claims that all their grade 8 students read an average of 10
storybooks a month with a standard deviation of 2 books. A random sample of grade
8 students read an average of 12 books a month and a standard deviation of 1 book.
The confidence level is 95%.​

Answer 1

Answer:

a)

H0: all the grade 8 students read an average of 10 storybooks a month

Ha: the grade 8 students do not read an average of 10 storybooks a month

H0: μ = 10

Ha: μ ≠ 10

b)

H0: the mean working time of workers in the factory is 6 hours

Ha: the mean working time of workers in the factory is not 6 hours

H0: μ = 6

Ha: μ ≠ 6

Explanation: