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Unformatted text preview: for μ. (Exercise 7.10) x x x 2846 . 9 . 25 90 7 . 2 2 9 . 25 2 ± = ± = ± n s x SmallSample Confidence Interval for a Population Mean If n < 30, then there are two problems. is not “normal enough” to use Z scores. s is not as good of an estimate of σ. n In this case, we use t, a mound shaped distribution similar to Z, to compensate. Using the tdistribution yields larger intervals. df = n  1 x LargeScale Confidence Interval for a Population Proportion is a sample proportion [ statistic ] n p is the population proportion [ parameter ] n is normally distributed [ Use Z. ] p ˆ p ˆ n pq p p p = = ˆ ˆ σ μ...
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This note was uploaded on 04/17/2008 for the course STAT 110 taught by Professor Pace during the Fall '07 term at Winona.
 Fall '07
 Pace

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