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Explanation & Answer
here is solution; please discuss if there is any doubt.
QSO 530: Z or t Tests
Problem 1
A random sample of 25 deliveries from a downtown Chicago department store
resulted in sample information of x =10.2 miles and s = 5.7 miles. At the 0.05 level of
significance, does this show sufficient evidence to reject the claim that the average
delivery is no more than 8.5 miles?
Null and Alternate Hypothesis
H0 : = 8.5
H 0 : 8.5
This corresponds to a left-tailed test, for which a t-test for one mean, with unk...
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