IntroStat-notes 11-29-07

# IntroStat-notes - -Requirements-simple random sample-the population standard deviation is known-either or both of these conditions are satisfied

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-Requirements -simple random sample -the population standard deviation is known -either or both of these conditions are satisfied: The population is normally distributed or n>30 -Point Estimate of the Population Mean -the sample mean (x w/line) is the best point estimate of the population mean (µ) -Sample Mean -for all populations, the sample mean is an unbiased estimator of the population mean -for many populations, the distribution of sample means tends to be more consistent (with less variation ) than the distributions of other sample statistics -the margin of error E is the maximum likely difference observed between the sample mean and the population mean -Procedure for constructing a confidence interval -verify that the requirements are satisfied -find the critical value (z sub alpha over 2) that corresponds to the desired degree of confidence -evaluate the margin of error -find the values of (x bar minus E) and (x bar plus E). Substitute those values in the general format of the confidence interval

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## This note was uploaded on 04/17/2008 for the course MATH unknown taught by Professor Sapko during the Fall '08 term at Mass Colleges.

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IntroStat-notes - -Requirements-simple random sample-the population standard deviation is known-either or both of these conditions are satisfied

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