Question: Psychologists studied the relative efficacy of three different treatment programs
Psychologists studied the relative efficacy of three different treatment programs – A, B, and C – on illicit drug abuse. The following data represent the number of days of drug abstinence accumulated by 15 patients (5 in each treatment program) for the 3 months after their treatment program ended. Thus, a larger number of days indicates a longer period free of drug use.
Test the null hypothesis that these drug-treatment programs do not differ in regard to their efficacy.
Answer to relevant QuestionsDoes a woman’s chance of suffering from postpartum depression vary depending on the number of children she already has? To find out, a researcher collected random samples from four groups of women: the first group having ...A researcher collected samples of sexually active adolescents from various racial and ethnic backgrounds and asked them what percent of the time they use protection. Given the following data, test the null hypothesis that ...1. Which is not true of parametric tests? a. They require interval data. b. They require normality in the population. c. They are less powerful than nonparametric tests. d. None of the above. 2. In a chi-square test, the ...A computer company conducted a “new and improved” course designed to train its service representatives in learning to repair personal computers. One hundred trainees were split into two groups on a random bases: 50 took ...A researcher concerned with racial justice suspects that jurors might perceive the severity of a crime as greater when the victim is white rather than black. She provides mock jurors with videotapes of trials (in which the ...
Post your question