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Introduction to Confidence Intervals
7. Sampling Distributions & Confidence Intervals: Mean / Introduction to Confidence Intervals / Problem 2
Problem 2

A biologist records the weights in grams of two species of birds.
Species X:15.2,15.5,15.1,15.3,15.4:15.2,15.5,15.1,15.3,15.4
Species Y:14.8,15.0,15.2,14.9,15.1:14.8,15.0,15.2,14.9,15.1
Construct a 9595 percent confidence interval estimate for the variance of each species' weights. Is there evidence of a difference in variation between the two species?