Question 1174776
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Hi

Sample:  n = 15 , mean = .68,  sd = .08

Ho: u =  .70 (claim)
Ha: u < .70
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 t(.68) = (.68 -.70)/[.08/sqrt(15)] = -.0645
 p-value = P( t< -.0645 when df = 14) = .47

Since the p-value is greater than 5%, fail to reject Ho.
Conclusion: The claim is reasonable at the 5% confidence level.

Wish You the Best in your Studies.
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