DSC04859 2

457

Section 6.2 Exercises

(a) State Hq and H_a.

(b) Carry out the test and give the P-value, assuming that a = 0.4 in this population. Report your conclusion.

(c) Give a 95% confidence interval for the mean calcium level fi in this population. We are confident that fi lies ąuite close to 9.5. This illustrates the fact that a test based on a large sample (n = 180 here) will often declare even a smali deviation from Ho to be statistically significant.

6.49 Here are the Degree of Reading Power (DRP) scores for a sample of 44 third-grade students:

40	26	39	14	42	18	25	43	46	27	19
47	19	26	35	34	15	44	40	38	31	46
52	25	35	35	33	29	34	41	49	28	52
47	35	48	22	33	41	51	27	14	54	45

These students can be considered to be an SRS of the third-graders in a suburban school district. DRP scores are approximately normal. Suppose that the standard deviation of scores in this school district is known to be

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40	26	39	14	42	18	25	43	46	27	19
47	19	26	35	34	15	44	40	38	31	46
52	25	35	35	33	29	34	41	49	28	52
47	35	48	22	33	41	51	27	14	54	45

40	26	39	14	42	18	25	43	46	27	19
47	19	26	35	34	15	44	40	38	31	46
52	25	35	35	33	29	34	41	49	28	52
47	35	48	22	33	41	51	27	14	54	45

40	26	39	14	42	18	25	43	46	27	19
47	19	26	35	34	15	44	40	38	31	46
52	25	35	35	33	29	34	41	49	28	52
47	35	48	22	33	41	51	27	14	54	45