4. Data were collected from a pretest and posttest of students taking a two-week course in substance abuse. Would you use a t-test (and if so, which one), or would you use ANOVA? Given the following data, complete the exercise to see if there is a significant difference between the two tests. Pretest Posttest 84 90 85 75 70 89 65 91 71 85 72 79 84 88 85 85 66 82 67 99
4. Data were collected from a pretest and posttest of students taking a two-week course in substance abuse. Would you use a t-test (and if so, which one), or would you use ANOVA? Given the following data, complete the exercise to see if there is a significant difference between the two tests. Pretest Posttest 84 90 85 75 70 89 65 91 71 85 72 79 84 88 85 85 66 82 67 99
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:### Analyzing Pretest and Posttest Data
**Study Context:**
Data were collected from a pretest and posttest administered to students participating in a two-week course on substance abuse. The objective is to determine whether there is a significant difference between the two sets of scores.
**Statistical Analysis Question:**
Should you use a t-test (and if so, which type) or an ANOVA to analyze the data?
**Data Table:**
| Pretest | Posttest |
|---------|----------|
| 84 | 90 |
| 85 | 75 |
| 70 | 89 |
| 65 | 91 |
| 71 | 85 |
| 72 | 79 |
| 84 | 88 |
| 85 | 85 |
| 66 | 82 |
| 67 | 99 |
**Instructions:**
To determine if there is a significant difference between the pretest and posttest scores, consider using a paired t-test, as the data consists of two related groups (i.e., the same students taking both tests). This test will help analyze the changes in scores due to the course.
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