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Unformatted text preview: MINITAB Assignment 4 2a. i. Calculate the 95% Confidence Interval for the population mean height of a freshman. Interpret the confidence interval. Use MINITAB to compute the confidence interval. (Copy and paste the MINITAB commands you used and the results found in the Session window after your answer.) The 95% confidence interval for the population mean height of a freshman is (65.892, 67.108). ————— 4/11/2010 9:46:25 PM ———————————————————— Welcome to Minitab, press F1 for help. MTB > onez 270 66.5; SUBC> sigma 5.1; SUBC> conf 95. OneSample Z The assumed standard deviation = 5.1 N Mean SE Mean 95% CI 270 66.500 0.310 (65.892, 67.108) ii. Calculate the 90% Confidence Interval for the population mean height of a freshman. Interpret the confidence interval. Use MINITAB to compute the confidence interval. (Copy and paste the MINITAB commands you used and the results found in the Session window after your answer.) The 90% confidence interval for the population mean height of a freshman is (65.989, 67.011). MTB > onez 270 66.5; SUBC> sigma 5.1; SUBC> conf 90. OneSample Z The assumed standard deviation = 5.1 N Mean SE Mean 90% CI 270 66.500 0.310 (65.989, 67.011) iii. As you decrease the level of confidence, how will this affect the precision (i.e., the width) of the interval? (Note: The smaller the interval, the more precise it is.) As you decrease the level of confidence, the interval decreases. Therefore, the precision increases as you decrease the level of confidence....
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 Fall '08
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 Statistics, Statistical hypothesis testing, 0.310 90%, 0.310 95%

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