EXERCISE 10.46: To test the hypothesis that students who finish an exam first ge

Question

EXERCISE 10.46: To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of 24.9. Set the significance level at a = .05

Which of the following is the level of significance and degrees of freedom?
A. a=0.05 B. a=0.05 C. a=0.05 D. a=0.05 E. a=0.05

Explanation / Answer

Level of significance is stated in the problem (a = 0.05) and the degrees of freedom is n1 -1 + n2 -1 = 25 - 1 + 24 - 1 = 47

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