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A study was made to estimate the difference in salaries of college professors in the private...

A study was made to estimate the difference in salaries of college professors in the private and state college of Virginia. A random sample of 100 professors in private colleges showed an average 9 months salary of 25050.55 with a standard deviation of 1098.62. A random sample of 200 professors in state colleges showed an average salary of 26006.71 with a standard deviation of 1362.17. Construct a 90% confidence interval for the ratio of two variances.

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