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A standardized test is given to a sixth grade class and an eleventh grade class. The...

A standardized test is given to a sixth grade class and an eleventh grade class. The superintendent believes that the variance in performance for the two grades is different. The sample variance of a sample of 11 test scores from the sixth grade class is 16.89. The sample variance of a sample of 13 test scores from the eleventh grade class is 13.78. Construct the 95% confidence interval for the ratio of the population variances. Round your answers to four decimal places.

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Answer #1




n1 = 11
n2 = 13




Lower Limit =
Upper Limit =
95% Confidence interval is ( 0.3637 , 4.437 )
( 0.3637 < < 4.4370 )

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