# STAT 1034 Lecture Notes - Lecture 6: Confidence Interval, Electric Light, Statistical Hypothesis Testing

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An srs of 30 bulbs has an average life of 780 hours. This means that 95% of all possible intervals in repeated sampling of the same size will contain : choose and srs of size n from a population having and known. The margin of error for a level c ci for is m = (cid:4666) (cid:3041)(cid:4667: sd of 52 adults resting heart rate is 6. 4 beats per minute. Find a 95% ci for the average resting heart rate among all adults: = (cid:889)2. (cid:889),=(cid:888). (cid:886), n = 52, c-level = . 95, a = 70. 93. = 2. 46: p-val: 2p(z |2. 46|, normalcdf: -1e99, -2. 46, 0, 1 = . 0069: 2(. 0069) = . 0138 = 1. 38, p-val vs. -level, 1. 38% > 1, results are not stat sig. Based on the data it appears that the average sat score in. Us average: what would ho and ha be if we suspected that the mean score of.

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