Question

QUESTION 5 The student welfare office was interested in trying to enhance students' exam performance by investigating the effects of various interventions. They took five groups of students before their statistics exams and gave them one of five interventions: (1) a control group just sat in a room contemplating the task ahead; (2) the second group had a yoga class to relax them; (3) the third group were told they would get monetary rewards contingent upon the grade they received in the exam; (4) the fourth group were given beta-blockers to calm their nerves; and (5) the fifth group were encouraged to sit around winding each other up about how much revision they had/hadn't done (a bit like what usually happens). The final percentage obtained in the exam was the dependent variable. Using the critical values for F, how would you report the result in the table below? SSDf 1213.6 707.9 1921.5 33 Model Residual Total MS 303.4 21.4 12.43** Type of intervention did not have a significant effect on levels of exam performance, F(4, 29) - 12.43, p > .05. Type of intervention did not have a significant effect on levels of exam performance. F(4.33) 12.43. p > .01. Type of intervention had a significant effect on levels of exam performance, F(4,29) = 12.43, p <.01. Type of intervention had a significant effect on levels of exam performance, F(4, 33) = 12.43, p <.01.

Answer 1

Q 5 ) The student welfare office was interested in trying to enhance students exam performance by investigation the effects of various interventions.

The test statistic F = 12.43

The p-value for F = 12.43 and d.f = 4,29

p-value = 0.00002

So if p-value < a ( level of significance ) then we reject the null hypothesis Ho

P-value = 0.00002 < 0.01

Conclusion : Type of intervention had a significant effect on levels of exam performance F( 4, 29) = 12.43 , p < 0.01