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Unformatted text preview: A B 64.01 63.98 s .326 .385 n 100 100 The test used to compare the variances is called the two sample F test in which the F statistic has the following distribution shape. ____________________________________________ If Ho is true we would expect the ratio of F = to be approximately equal to one. (note that the TI calculator and the computer both always have in the numerator). If < , we would expect the ratio to be less than one and if > we would expect the ratio to be greater than one. With the TI we use the 2SampFTest Input: Data Stats F = .7169 Sx 1 .326 p = .04976 n 1 100 Sx 2 .385 n 2 100 1 : < 2 Thus we cannot state with 99% confidence that machine A is less variable than machine B....
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 Fall '10
 RaySievers
 Statistics, Addition, Variance

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