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Great Day!! 9.2 SAMPLE PROPORTIONS p = population proportion proportion of people who voted for Obama in US = p hat, sample proportion proportion of people who voted for Obama in our sample is an unbiased estimator of p. The sampling distribution of the sample proportion phat has a shape that is close to normal. Its mean is close to the population proportion p. The standard deviation of its sampling distribution gets smaller as the size of the sample gets larger. The standard deviation of the sampling distribution is √ p(1-p) n Rule of Thumb 1: Use this formula for standard deviation of only when the Population is at least 10 times as large as the sample. N > 10n Rule of Thumb 2: Use the normal approximation to the sampling distribution of ê for values of n and p that satisfy np ≥ 10 and n(1-p) ≥ 10 Lets do #15 & 17 p.477 Assignment: p.477 – 478 #16,18,19 - 21