Past data indicate that the standard deviation of measurements made on sheet metal stampings by experienced inspectors is 0.41 square inch. If a new inspector measures 50 stampings with a standard deviation of 0.49 square inch, use the method of Exercise 13.7 to test the null hypothesis σ = 0.41 square inch against the alternative hypothesis σ > 0.41 square inch at the 0.05 level of significance.
Answer to relevant QuestionsWith reference to Example 13.5, test the null hypothesis σ1 – σ2 = 0 against the alternative hypothesis σ1 – σ2 > 0 at the 0.05 level of significance. With reference to Exercise 13.57, find the critical region and the actual level of significance corresponding to this critical region. In exercise It has been claimed that more than 40 percent of all shoppers can identify a ...A food processor wants to know whether the probability is really 0.60 that a customer will prefer a new kind of packaging to the old kind. If, in a random sample, 7 of 18 customers prefer the new kind of packaging to the old ...In a random sample of 200 persons who skipped breakfast, 82 reported that they experienced midmorning fatigue, and in a random sample of 300 persons who ate breakfast, 87 reported that they experienced midmorning fatigue. ...Four coins were tossed 160 times and 0, 1, 2, 3, or 4 heads showed, respectively, 19, 54, 58, 23, and 6 times. Use the 0.05 level of significance to test whether it is reasonable to suppose that the coins are balanced and ...
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