# The chi square test for independence is used to

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Question 27The chi-square test for independence is used to decide if observed frequencies follow a known probability distribution
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Question 28A 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 α = 0.05, the critical value for this hypothesis test would be ________.
CommentsCorrect!!Max Score: 4Actual Score: 4Question 29YouTube 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. Using α = 0.10, the critical value for this hypothesis test would be ________.
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