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Unformatted text preview: • Standardize and Use Table o More/less than 3 standard deviations aren’t realistic o Sampling error is not a plausible explanation for low sample mean Nonsampling error Selectionbias, or lying about parameters • Sales Training Example o We don’t know what the shape is, but it doesn’t matter according to the Central Limit Thoerem o Expected mean to increase by 15 but not standard deviation o Slide 18 Sampling distribution of the difference of the means Sampling error can’t explain the difference • Difference Between Two Means o Combining bellshaped distributions gives another bellshaped distribution o As long as it is a linear combination • Mean and Variance of Sampling Distribution of Difference o In order for the difference of the two to be bellshaped, both means need to independently produce a bellshaped distribution...
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 Fall '11
 tanaka
 Economics, Standard Deviation, small sampling error

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