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Paired t-Test for Assessing Aggression Levels Before and After Intervention

A study using paired t-tests to evaluate the impact of intervention on aggression levels before and after treatment.

Anna Wilson
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Paired t-Test for Assessing Aggression Levels Before and After InterventionAssignment: t-test for two measures•DueFriday by 1:59am•Points10•Submittinga file upload, a text entry box, or a website urlExercise 10: t-test for two measures in asingle sampleAs preparation for this exercise, you are strongly advised do the Time to Practice exercise 2, 5, and 6 inchapter 12, and check your work against the correct answers in the text.Test the hypothesis that the subjects were less aggressive after the intervention than before theintervention.1.State the null and research hypotheses:Null hypothesis H0: The subjects werenotless aggressive after the intervention than before theintervention.Alternative hypothesis Ha: The subjects were less aggressive after the intervention than beforethe intervention.2.Set the level of significance, or Type 1 error, and explain what it means.Take thelevel of significanceto be 0.05. It is the maximum type I error we could make.3.Select the appropriate test statistic, and explain why it is appropriate. Describe the formula (12.1)for the statistic and what it means.Since the two samples are dependent, it would be appropriate to conduct a paired t-test. So,when H0 is true, the test statistic given in the following follows a t-distribution with degree offreedom df=n-1.12)(2−−=nDDnDTIt is actually the same as the followingnsxDDT/=

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Subject
Psychology

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