Shamma is working at an addition recovery center. She reads somewhere that one of the differences between casual drug use and addiction is despair or depression. She randomly gives a group of her patients the Beck's Depression Inventory (BDI). She knows from previous research that a group of local patients with Major Depressive Disorder had a mean BDI score of 24.
After analyzing the One Sample T-test from her study she writes:
We conducted a one-tailed, one-sample t-test comparing the sample mean BDI score (28.4) against a population mean of 24, t(14) = 2.25, p = 0.021.
How many people were in Shamma's sample?
Using the information from Shamma's study in Question 21 write a null hypothesis and an alternative hypothesis.
