Homework_9_Solutions

# Homework_9_Solutions - Homework 9 Solutions 11.21 a 76 2.31...

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Homework 9 Solutions 11.21 a. 9 6 31 . 2 76 ± or 71.38 to 80.62; df = n 1 =9 1 = 8 for t * . b. 9 6 86 . 1 76 ± or 72.28 to 79.72 c. 16 6 75 . 1 76 ± or 73.375 to 78.625; df = n 1 = 16 1 = 15 for t * . d. 16 8 13 . 2 76 ± or 71.74 to 80.26 e. 16 8 13 . 2 100 ± or 95.74 to 104.26 11.23 a. 2.52 b. 2.13 c. 4.60 d. 2.06 e. 1.99 11.24 a. 2 9 6 ) ( s.e. = = = n s x . Roughly, this is the average difference between the sample and population means over all random samples of n = 9 that can be selected from this population. b. 26.2 ± (2 × 2), or 22.2 to 30.2 sit-ups. c. With 95% confidence, we can estimate that in the population of men represented by this sample the mean number of sit-ups in a minute is between 22.2 and 30.2. 11.31 a. 3 . 0 81 7 . 2 ) ( s.e. = = = n s x inch. Approximate 95% confidence interval is Sample estimate ± 2 × Standard error , which is 64.2 ± (2 × 0.3), or 63.6 to 64.8 inches. b.

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Homework_9_Solutions - Homework 9 Solutions 11.21 a 76 2.31...

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