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Unformatted text preview: of freedom , is formed. • Based upon ChiSquare, and thus, Z, and thus the Normal Distribution • The normal distribution is the mother of all important distributions that we form. DISTRIBUTIONS: Normal (regular normal) Z tdistribution ChiSquare FDistribution APPLIED STATISTICS BEGINS… III. Interval Estimators A. Confidence Interval – A formula for determining a range of values that will contain the true population parameter with fixed probability in repeated sampling. Example – A 90% confidence interval for the population mean uses the point estimator (sample mean of X) to find the values for “a” and “b” such that: 1.) The probability in repeated sampling that the confidence interval will not contain (whatever it is we are estimating, like µ ) is a. Alpha is the probability of an error (later, alpha = the level of significance) NO EXERCISE FOR FRIDAY...
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 Spring '09
 Casler
 Normal Distribution, Chisquare random variable, ChiSquare FDistribution APPLIED

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