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In 12 test runs over a marked course a newly

In 12 test runs over a marked course, a newly designed motorboat averaged 33.6 seconds with a standard deviation of 2.3 seconds. Assuming that it is reason-able to treat the data as a random sample from a normal population, use the four steps on page 354 to test the null hypothesis µ = 35 against the alternative µ < 35 at the 0.05 level of significance.

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