A researcher predicts that children who play violent video games are more aggres

Question

A researcher predicts that children who play violent video games are more aggressive than children who play non-violent video games. he selects one sample of 8 children who play violent video games and one sample of 7 children who play non-violent video games. On a measure of aggression, he calculates the sample mean to be 18.3 for the non-violent video game group, the sample mean to be 14.9 for the violent video game group, and the estimated standard error of the mean difference to be 2.15. Using a one-tailed t-test and alpha = .05, analyze the data. What decision should the researcher make regarding the null hypothesis in this scenario?

A. Fail to reject the null hypothesis

B. Reject the null hypothesis

C. Accept the alternative hypothesis

D. Not enough information to make a decision

Explanation / Answer

Ans:

Test statistic:

t=(18.3-14.9)/2.15=1.581

Assuming equal population variances,df=7+8-2=13

p-value=tdist(1.581,13,1)=0.0690*

*(even if population variances are not equal,then df=7-1=6,p-value=0.0825)

As,p-value>0.05,we fail to reject the null hypothesis.

Option A is correct.

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