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April 7th, 2007, 03:05 AM   #1
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Find critical value, F-test value and Test Null Hyp.

Customer waiting times are studied at the Jefferson Valley Bank. When 25
randomly selected customers enter any one of several waiting lines, their
times have a mean of 6.896 minutes and a standard deviation of 3.619
minutes. When 20 randomly selected customers enter a single main waiting
line that feeds the individual teller stations, their waiting times have a
mean of 7.460 minutes and a standard deviation of 1.841 minutes. Use a 0.05
significance level to test the claim that waiting times for the single line
have a lower standard deviation. What are the critical value and F test
value, each to 3 decimal places of precision? Do you reject the null
hypothesis (Yes or No)?
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