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In trials of an experimental internet-based method of learning statistics, pretests and post-tests were given to two groups: traditional instruction (22 students) and internet-based (17 students). Pretest scores were not significantly different. On the post-test, the first group (traditional instruction) had a mean score of 8.64 with a standard deviation of 1.88, while the second group (experimental instruction) had a mean score of 8.82 with a standard deviation of 1.70. (a) Construct a 90 percent confidence interval for the true difference of the means assuming equal variances. Show all work clearly. (b) Repeat, using the assumption of unequal variances with cither Welch’s formula for d.f. or the quick rule for degrees of freedom. (c) Did the assumption about variances change the conclusion? (d) Construct separate confidence intervals for each mean. Do they overlap?
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Gen Combo Ll Applied Statistics In Business & Economics; Connect Access Card
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillCollege Algebra (MindTap Course List)AlgebraISBN:9781305652231Author:R. David Gustafson, Jeff HughesPublisher:Cengage LearningCalculus For The Life SciencesCalculusISBN:9780321964038Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.Publisher:Pearson Addison Wesley,
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