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March 1, 2015

March 1, 2015

Posted by **Jennifer** on Monday, March 1, 2010 at 3:22pm.

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. Is this a significant difference at á = .05? (a) State the

hypotheses for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances.

Interpret these results. (c) Is the difference in mean scores large enough to be important? (d) Is it reasonable

to assume equal variances? (e) Carry out a formal test for equal variances at á = .05, showing

all steps clearly.

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