Bass Fishing The pH factor is a measure of theacidity or

Chapter 9, Problem 59

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Bass Fishing The pH factor is a measure of theacidity or alkalinity of water. A reading of 7.0 is neutral;values in excess of 7.0 indicate alkalinity; thosebelow 7.0 imply acidity. Loren Hill states that the bestchance of catching bass occurs when the pH of thewater is in the range 7.5 to 7.9.18 Suppose you suspectthat acid rain is lowering the pH of your favorite fishingspot and you wish to determine whether the pH isless than 7.5.a. State the alternative and null hypotheses that youwould choose for a statistical test.b. Does the alternative hypothesis in part a imply aone- or a two-tailed test? Explain.c. Suppose that a random sample of 30 water specimensgave pH readings with x 7.3 and s .2.Just glancing at the data, do you think that the differencex 7.5 .2 is large enough to indicatethat the mean pH of the water samples is less than7.5? (Do not conduct the test.)d. Now conduct a statistical test of the hypotheses inpart a and state your conclusions. Test usinga .05. Compare your statistically based decisionwith your intuitive decision in part c.