Question27 ofA professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam has a standard deviation that is less than 5.0 minutes. The correct hypothesis statement would be ________. 40H0: μ ≥ 5; H1: H0: σ2 ≥ 25; H1: σ2 < 25.H0: σ2 = 5; H1: σ2 ≠ H0: σ = 25; H1:

μ < 5.

5.

≠Question28 ofA professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam has a standard deviation that is less than 5.0 minutes. A random sample of 15 students was selected, and the sample standard deviation for the time needed to complete the exam was found to be 4.0 minutes. The test statistic for this hypothesis test would be ________. σ25. 40

Question29 ofA professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam has a standard deviation that is less than 5.0 minutes. A random sample of 15 students was selected, and the sample standard deviation for the time needed to complete the exam was found to be 4.0 minutes. Using 0.05, the conclusion for this hypothesis test would be that because the test statistic ismore than the critical value, you fail to reject the null hypothesis and conclude that the standard deviation for the time 40α =

Question30 ofYouTube would like to test the hypothesis that the standard deviation for the length of an online video watched by a user is more than 2 minutes. A random sample of 21 people who watched online videos was selected. The sample standard deviation for the length of the video was found to be 2.5 minutes. The test statistic for this hypothesis test would be ________. 40

Question31 ofYouTube would like to test the hypothesis that the standard deviation for the length of an online video watched by a user is more than 2 minutes. A random sample of 21 people who watched online videos was selected. The sample standard deviation for the length of the video was found to be 2.5 minutes. The degrees of freedom for this hypothesis test would be ________. 4018192021