"research hypothesis was there is a significant positive relationship between reports of sleep adequacy and the performance on a driving test. a positive correlation was found between the variables of self-reported sleep adequacy and performance on the driving simulator (r = 0.21, p = .37), although the correlation did not reach statistical significance."

The relationships among the variables are too weak to have practical application.

Explanation:

Here, the research hypothesis states that there is a significant positive relationship between reports of sleep adequacy and the performance on a driving test. However, one needs to look at the given r value to understand the correlation between the variables. Here, r value is reported to be 0.21 so it is a positive value but a weak one. R value needs to be over 0.3 at least to consider it a moderate correlation. Hence, it is a weak positive correlation. However, we also must look at the p value to establish its significance. P value need to be less than 0.05 in general to consider a result significant. Here, it is reported to be 0.37 which means that the relationship among the two variables is too weak to have practical application and is not significant to be considered for application.