An online retailer ships products from overseas with an advertised delivery date within 10 days. To test

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An online retailer ships products from overseas with an advertised delivery date within 10 days. To test whether or not deliveries are made within the advertised time, a random sample of 10 orders is selected from a normal population. The sample mean delivery time is 12 days, and the standard deviation is 3 days. Given the following hypotheses:
H0: μ ≤ 10
H1: μ > 10
Using the 0.05 significance level:
a. State the decision rule.
b. Compute the value of the test statistic.
c. What is your decision regarding the null hypothesis?

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Basic Statistics For Business & Economics

ISBN: 9781259268939

6th Canadian Edition

Authors: Douglas A. Lind, William G Marchal, Samuel A. Wathen, Carol Ann Waite

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