Descriptive Statistics and Assignment
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Descriptive Statistics and Mean-Level Comparisons Assignment
| Descriptive Statistics and Mean-Level Comparisons | |||||||||
| SMI Parents | Comparison Parents | ||||||||
| N = 61 | N = 321 | ||||||||
| Mean | SD | Mean | SD | t | p | ||||
| Stress | |||||||||
| Number of stressors | 0.65 | 0.56 | 0.42 | 0.37 | -3.08 | 0.00 | |||
| Stress severity sum | 1.89 | 1.63 | 1.16 | 1.1 | -3.3 | 0.00 | |||
| Cortisol (nmol/L) | |||||||||
| Wake | 17.46 | 10.72 | 16.75 | 7.38 | -0.14 | 0.90 | |||
| Out of bed | 22.83 | 11.48 | 24.19 | 10.59 | 1.13 | 0.26 | |||
| Bed | 5.72 | 8.56 | 4.22 | 5.57 | -1.86 | 0.06 | |||
| Cortisol awakening response | 5.62 | 9.7 | 7.48 | 8.34 | 1.55 | 0.12 | |||
| Decline from out of bed | 17.13 | 11.35 | 20.11 | 10.71 | 1.97 | 0.05 | |||
| Medication use (proportion) | |||||||||
| Allergy | 0.26 | 0.44 | 0.16 | 0.37 | -1.71 | 0.09 | |||
| Steroid | 0.2 | 0.4 | 0.12 | 0.33 | -1.32 | 0.19 | |||
| Hormone | 0.13 | 0.34 | 0.14 | 0.35 | 0.25 | 0.80 | |||
| Anxiety or depression | 0.26 | 0.44 | 0.12 | 0.33 | -2.36 | 0.02 | |||
14. For each of the following studies, say whether you would use a t test for dependent means or a t test for independent means.
a. A researcher measures the heights of 40 university students who are the firstborn in their families and compares the 15 who come from large families to the 25 who come from smaller families.
b. A researcher tests performance on a math skills test of each of 250 individuals before and after they complete a one-day seminar on managing test anxiety.
c. A researcher compares the resting heart rate of 15 individuals who have been taking a particular drug to the resting heart rate of 48 other individuals who have not been taking the drug.
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