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1) A survey found that the average hotel room rate in new orleans is 88

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1) A survey found that the average hotel room rate in new orleans is 88.42 and the average room rate in phoenix is 80.61. Assume that the data was obtained from two samples of 50 hotels each and that the standard deviations were 5.62 and 4.83 respectively. At alpha=.05, so it can be concluded that there is a significant difference in rates?

2) Find the critical value for a right-tailed F-test when alpha=.05 the degrees of freedom for the numerator (d.f.N.) are 15, and the degrees of freedom for the denominator (d.f.N.) are 21.

3)Find the critical value for a two tailed F-test with alpha=.05 when the sample size from which the variance for the numerator was obtained was 21 and the sample size from which the variance for the denominator was obtained 12