Wednesday
July 30, 2014

Homework Help: statistics

Posted by cindy on Thursday, March 15, 2012 at 8:44pm.

10.51 A statistics professor compared the scores of her morning class and afternoon class on the same
quiz. The 42 morning students’ average score was 83.52 with a standard deviation of 7.81, while
the 46 afternoon students’ average score was 79.44 with a standard deviation of 6.62. (a) Which
test would you use to compare the means? (b) State the hypotheses to see if there was a difference.
(c) Obtain a test statistic and p-value. (d) Why might there be a difference between morning and
afternoon scores? Explain. (e) Is it reasonable to assume equal variances? (f) Carry out a formal
test for equal variances at á = .05, showing all steps clearly.
could you please help explain the steps to this problem

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