Hello! I could use some help with a quick part of this problem, based on the scenario below.

(a)What are the critical values? (Specify df_between and df_within first). In addition, present the decision rules.

I believe I have the decision rules right, but I need help with the critical values/how to calculate degrees of freedom between and within.

Thanks!

1. A health psychologist investigates the number of viral infections people contract as a function of the amount of psychological stress they experience during a one-year period. She wants to see if there are significant differences (at the significance level of 0.05) in the mean number of viral infections depending on the amount of stress. She obtained the following data (N=20): Negligible Minimal Moderate Severe Stress Stress Stress Stress ANWAN