In 12 test runs over a marked course, a newly designed motorboat averaged 33.6 seconds with a standard devia-tion of 2.3 seconds. Assuming that it is reasonable to treat the data as a random sample from a normal population,use the four steps in the initial part of Section 1 to testthe null hypothesis μ = 35 against the alternative μ < 35at the 0.05 level of significance.

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