Question:

Suppose that you are interested in determining the effectiveness of an intensive supervision probation (ISP) program. To examine its effectiveness, you keep track of 12 offenders sentenced to ISP for one year and tabulate the number of new offenses they committed. You also gather two control groups. The first consists of 12 offenders sentenced to routine probation. The second consists of 12 offenders whose cases were dismissed. The following results describe the number of new offenses each offender in each group committed during your one-year follow-up:

Sum of all the data = 133
Sum of the squares of all the data = 715

Using these data,

1. Identify the independent and dependent variables.

2. What are the null and alternative hypotheses

3. With an alpha of 0.01, test the null hypothesis against the alternative.

4. Find r- squared. What does it mean?