Heаth reseаrchers аre interested in decreasing Pоst-Traumatic Stress Disоrder amоng veterans. Researches use the Short Post-Traumatic Stress Disorder Rating Interview (SPRINT). The SPRINT in the general population are normally distributed with a mean score of 30 ± 15 (µ±σ). Researchers select a random sample of 100 veterans. These individuals complete an online intervention designed to reduce PTSD symptomology. In this sample, following the intervention, researchers record a sample mean equal to an 20 on the SPRINT scale. Compute a directional, one-sample z test to decide whether to retain or reject the null hypothesis at the .05 level of significance. You MUST show all 4 steps of hypothesis testing to receive full credit!
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