In a study of the effect of college student employment on academic performance, the following summary...
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 |
176 | 3.22 | 0.485 |
| Students Who Are Not Employed |
118 | 3.33 | 0.514 |
| 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 OR No
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In a study of the effect of college student employment on
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In a study of academic procrastination, the authors of a paper reported that for a sample of 441 undergraduate students at a midsize public university preparing for a final exam in an introductory psychology course, the mean time spent studying for the exam was 7.64 hours and the standard deviation of study times was 3.50 hours. For purposes of this exercise, assume that it is reasonable to regard this sample as representative of students taking introductory psychology at this university....
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