a company research team studied the relationship between brain storming/idea generation meetings with and without a moderator. for a random sample of four groups with a moderator, the mean number of ideas generated per group was 78 and standard deviation 24.4. for a random sample of four groups without a moderator, the mean number of ideas generated per group was 63.5 and standard deviation 20.2. the result of a test, at the 5% significance level, the assumption that the two population variances are equal against the alternative that the population variance is higher for a group with a moderator is: