stats 363 HW-Section-9-3

stats 363 HW-Section-9-3 - Section 9.3 Exercise 9.1. Test...

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Section 9.3 Exercise 9.1 . Test Statistic Level One- or Two- Tailed Test? Critical Value Rejection Region Conclusion z = 0 : 88 = 0 : 05 Two-Tailed 1 : 96 j z j > 1 : 96 Do not reject H 0 z = 2 : 67 = 0 : 05 Lower-Tailed 1 : 645 z < 1 : 645 Reject H 0 z = 5 : 05 = 0 : 01 Two-Tailed 2 : 575 j z j > 2 : 575 Reject H 0 z = 1 : 22 = 0 : 01 Lower-Tailed 2 : 33 z < 2 : 33 Do not reject H 0 Exercise 9.3 . ( a ) A right-tailed test with = 0 : 01 is z > 2 : 33. ( b j z j > 1 : 96. ( c z < 2 : 33. ( d ) A two-tailed test with = 0 : 01 is j z j > 2 : 575. Exercise 9.9 . This to test H 0 : ± = 28 versus H a : ± 6 = 28. With n = 100, x = 26 : 8, and s = 6 : 5, the test statistic is z = 26 : 8 18 6 : 5 = p 100 = 1 : 85 : Hence, the p -value is p -value = P f z < 1 : 85 g + P f z > 1 : 85 g = 2 (0 : 0322) = 0 : 0644 : Since the p -value is greater than 0 : 05, we do not reject
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stats 363 HW-Section-9-3 - Section 9.3 Exercise 9.1. Test...

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