Two sample hypothesis tests

Reference no: EM13110446

Show all steps and calculations clearly and solve the following problem:

To test the hypothesis that students who finish an exam first get better grades, the Professor kep track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviaiton 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 alpha = .05?

a) state the hypothesis 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 alpha = .05

(show all steps and attach excel spreadsheet if doing calculations on excel)

Reference no: EM13110446

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