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Hypothesis Test

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Three groups of students, 5 in each group, were receiving therapy for severe test anxiety. Group 1 received 5 hours of therapy, group 2 - 10 hours and group 3 - 15 hours. At the end of therapy each subject completed an evaluation of test anxiety (the dependent variable in the study). Did the amount of therapy have an effect on the level of test anxiety? Please develop the appropriate hypothesis test at a .05 level of significance and show and label all steps in your test. The three groups of students received the following scores on the Test Anxiety Index (TAI) at the end of treatment.

TAI Scores for Three Groups of Students

Group 1 - 5 hours Group 2 - 10 hours Group 3 - 15 hours
38 45 41
40 42 42
43 43 40
42 45 43
40 43 40

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Solution Summary

The solution provides step-by-step method of performing a Analysis of Variance or ANOVA Hypothesis Test. All the steps of hypothesis testing (formulation of null and alternate hypotheses, selection of significance level, choosing the appropriate test-statistic, decision rule, calculation of test-statistic and conclusion) have been explained in details. A separate Excel sheet showing the ANOVA analysis has also been included.

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Anwesha Ghosh, MSc
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  • MSc, Indian Institute of Technology - Roorkee (I.I.T.-ROORKEE)
  • BSc, Banaras Hindu University
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