Answered: To compare the effects of the 3 methods…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.5: Interpreting Data

Problem 26E

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To compare the effects of the 3 methods for showing critical thinking in science, 3 comparable groups of students comprising of 5 students per group were formed and the 3 methods (Method A, Method B, Method C) were randomly assigned to these groups. At the end of 6 week period, an achievement test consisting of 5 open-ended problems was administered.

Assuming that the maximum possible score that a student can get is 50 points, the following hypothetical data for each group such that the scores of students under Method C are higher than in group A and group B

a) State the null and alternative hypotheses.
b) Compute the value of the KW statistic and explain the significance or non-significance of the value of KW.
c) Conduct the pairwise comparison test.

Achievement test scores of students after intervention
Method A
Method B
Method C
38
29
40
37
40
42
41
39
44
39
40
43
34
38
46

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