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lecture_12_f01 - Statistics 400 Lecture 12 Today Finish 8.4...

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Unformatted text preview: Statistics 400 - Lecture 12 Today: Finish 8.4; begin Chapter 9 Mid-Term Next Thursday Review Next Tuesday Small Sample Confidence Interval for the Population Mean If x 1 , x 2 , , x n is a random sample from a normal population with mean , and standard deviation , then a confidence interval for the population mean is: If you have use a distribution instead! )% 1 ( 100 - n S t X 2 / Example: Heights of males are believed to be normally distributed Random sample of 25 adult males is taken and the sample mean & standard deviation are 69.72 and 4.15 inches respectively Find a 95% confidence interval for the mean Small Sample Hypothesis Test for the Population Mean Have a random sample of size n ; x 1 , x 2 , , x n Test Statistic: : = H n S X t / - = Small Sample Hypothesis Test for the Population Mean (cont.) P-value depends on the alternative hypothesis: Where T represents the t-distribution with ( n-1 ) degrees of freedom ) ( value- p...
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lecture_12_f01 - Statistics 400 Lecture 12 Today Finish 8.4...

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