We are interested in testing whether the standard deviation of a population 1 is significantly greater than the standard deviation of population 2, at a 5% significance level. The sample sizes are: 9 for population 1 and 11 for population 2. The sample standard deviations are: 5 for population 1, and 4 for population 2.
1. The null hypothesis for the corresponding test is?
2. The value of the F statistic is?
3. The null hypothesis is rejected if the value of the test statistic is greater or equal to?