Statistical Sciences 1024A/B Chapter Notes - Chapter 14: Confidence Interval, Standard Deviation, Normal Distribution
24 Sep 2015
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14. 1: (a) the sampling distribution of x has mean. (unknown) and standard deviation n x fall within 2 standard. = 0. 1506. (b) according to this rule, 95% of all values of deviations of the sampling distribution of. A 95% confidence interval is 22 2(2. 5) = 22 5, or between 17 and 27. 14. 3: shown below are sample output screens for (a) 10 and (b) 1000 srs"s. In 99. 4% of all repetitions of part (a), students should see between 5 and 10 hits (that is, at least 5 of the 10. Srs"s capture the true mean observe between 76% and 84% capturing the mean. Out of 1000 80% confidence intervals, nearly all students will. 14. 5: search table a for 0. 075 (half of the 15% that is not included in the middle, shaded area corresponding to 85% confidence). This area corresponds to z* = 1. 44, or z* = 1. 44.
