1. You work for a social services organization that evaluates testing conditions for standardized tests like the SAT. You want to know if adverse conditions (cold/hot rooms, ambient noise, disruptions, etc.) significantly affect test scores for the SAT. You sample 46 students at a local high school where adverse conditions are abnormally high and find their mean verbal SAT score was 535. If the national parameters are = 495, = 116). Identify the independent (+levels) and dependent variables. Does the independent variable significantly affect the dependent variable? What do you conclude? Use = 0.05.
2. You want to know whether national disasters significantly affect anxiety. You use an established anxiety scale with = 50, = 45). You sample N = 87 individuals from San Francisco right after a major earthquake, and the sample has M = 70. Identify the independent (+levels) and dependent variables. Does the independent variable significantly affect the dependent variable? What do you conclude? Use = 0.05.
3. You are testing whether a new drug raises the number of T cells in the blood (which help fight disease). You treat a sample of 120 subjects and find the mean T-cell count in their blood is 29. Identify the independent (+levels) and dependent variables. If = 36, = 41, what do you conclude? Use = 0.05.