A researcher is interested in determining if participation in extracurricular activities

affects academic performance. High school students are randomly assigned to one of

three conditions: no activities, some activities, many activities. The data from the final

exam scores are as follows:

No activities: 75 74 66 79 62 68 59 73 76 69

Some activities: 78 85 85 77 81 76 90 85 73 80

Many activities: 58 70 58 59 62 55 58 63 67 59