Question 1 An independent t-test uses n = 16 participants. What are the df for this t-statistic? O df = 16 O df = 15 O df - 30 O df = 17 Question 2 A health coach tested the effectiveness of a new harm reduction behavioral therapy for nicotine cessation among college students. A sample of n = 16 college student participated in the 6-week study and results were t (15) = -2.50, p = <.05. which the correct decision and explanation o reject null hypothesis students smoked fewer cigarettes after participating in program. fail to fall more question of following is not an assumption t-test population distribution scores should be symmetrical sample size typically less than data nominal or ordinal mean known but standard deviation>