1. The student welfare office was interested in trying to enhance students’perfo

Question

1. The student welfare office was interested in trying to enhance students’performance by investigating the effects of various interventions. They took five groups of students before their statistics 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 was the dependent variable. Using the critical values for F, how would you report the result of significance in the table below? SS Df MS F

Model 1213.6 4 303.4 12.43**

Residual 707.9 29 21.4

Total 1921.5 33

Explanation / Answer

The Test statistic F = 12.43

The critical value of F = 2.701 at 5% los and (4,29) df

In Excel, for Critical value

=F.INV.RT(0.05,4,29)

Here F value > F critical value so, we reject H0

Thus we conclude that there is significance difference among the means of the 5 groups

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