In a study of the effect of college student employment on academic performance,

Question

In a study of the effect of college student employment on academic performance, the following summary statistics for GPA were reported for a sample of students who worked and for a sample of students who did not work. The samples were selected at random from working and nonworking students at a university. (Use a statistical computer package to calculate the P-value. Use Hemployed Unot employed. Round your test statistic to two decimal places, your df down to the nearest whole number, and your P-value to three decimal places.) Sample Mean Standard GPA Deviation Size Students Who 176 3.22 0.485 Are Employed Students Who 116 3.33 0.524 Are Not Employed t* 1.81 df 232 071

Explanation / Answer

For the given values of the

test statistic

t=-1.81  

and degrees of freedom

DF=232    

The two-tailed P value equals 0.0716

so the correct answer should be 0.072

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