ENVS278 Study Guide - Comprehensive Midterm Guide: Confidence Interval, Ingot, Null Hypothesis

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A = that two people in a group of size n share a birthday. What size n lends to p(a) > 0. 5. N ~ 23: research shows that this is sufficient. P(2) = 365 (n 1)/365 (n = 2) P(not (a)n=23) = (n=1) x (n=2) x (n=3) x x (n=23) P(not (a) n=23) = 1 x 0. 997 x 0. 994 x x 0. 94. In class, we found a match at n=13. Chapter 5 the standard deviation as a ruler and the normal model. To standardize a value, we subtract the mean and then divide this difference by the standard deviation. The values are called standardized values and are commonly denoted with the letter z we call them z-scores. Z-scores measure the distance of a value from the mean in standard deviations. A z-score of 0 says that a data value sits on the mean. A z-score of 2 says that a data value is two standard deviations above the mean.

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