A professor wants to make sure that two different versions of a test are equivalent. He decides to compare the variances

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A professor wants to make sure that two different versions of atest are equivalent. He decides to compare the variances of thetest scores from each version. A sample of 2727 scores onVersion A has a sample variance of 2.5012.501, while a sampleof 1414 scores from Version B has a sample varianceof 4.5374.537.
Step 1 of 2 :
Construct a 90%90% confidence interval for the ratioof the population variances of the scores on the two versions ofthe test. Round the endpoints of the interval to four decimalplaces, if necessary.