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 ?employed − ?not 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 Size Mean GPA Standard Deviation Students Who Are Employed 172 3.22 0.485 Students Who Are Not Employed 120 3.33 0.524 t = df = P = Does this information support the hypothesis that for students at this university, those who are not employed have a higher mean GPA than those who are employed? Use a significance level of 0.05. Yes No
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 ?employed − ?not 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.)
Size |
GPA |
Standard Deviation |
|
Students Who Are Employed |
172 | 3.22 | 0.485 |
Students Who Are Not Employed |
120 | 3.33 | 0.524 |
t | = |
df | = |
P | = |
Does this information support the hypothesis that for students at this university, those who are not employed have a higher mean GPA than those who are employed? Use a significance level of 0.05.
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