DrSadik Is Studying the Effects of a New Anxiety Drug

Multiple Choice

Dr.Sadik is studying the effects of a new anxiety drug on the ability of obsessive-compulsive patients to ignore their obsessive thoughts and not need to carry out their compulsive behaviours.To do this,she uses three doses of drug on different groups of patients: some take a high dose,others a low dose,and others take a placebo sugar pill.She then measures the number of compulsive behaviours performed by each patient.What statistic would Dr.Sadik use to determine if she has a significant difference between groups?

A) correlation coefficient
B) t-test
C) analysis of variance
D) standard deviation