Assignment 4 (FINAL
RESEARCH REPORT
ANSWERS) 2025 (600847)
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, Results
Preliminary Analysis
Prior to testing the primary hypotheses, the means, standard deviations, and intercorrelations for
the key variables—sleep quality, perceived stress, and grade point average (GPA)—were
examined. The results are presented in Table 1.
Table 1
*Means, Standard Deviations, and Intercorrelations for Study Variables (N = 150)*
Variable M SD 1 2 3
1. Sleep Quality 3.10 0.85 —
-
2. Perceived Stress 5.40 1.20 —
.65**
-
3. GPA (Academic Performance) 3.25 0.45 .48** —
.52**
Note. Sleep Quality was measured on a 1-5
scale (higher scores = better quality). Perceived
Stress was measured on a 1-10 scale (higher
scores = greater stress). GPA is on a 4.0 scale.
** p < .01.
As shown in Table 1, sleep quality was negatively correlated with perceived stress, *r* = -
.65, *p* < .001, indicating that better sleep quality was associated with lower stress levels. Sleep
quality was positively correlated with GPA, *r* = .48, *p* < .001, suggesting that better sleep
quality was associated with higher academic performance. Perceived stress was negatively
correlated with GPA, *r* = -.52, *p* < .001, indicating that higher stress was associated with
lower academic performance.