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%.
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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:
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