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

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### 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.
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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