In last week's assignment, we tested Benny's hypothesis that high-risk offenders had a significantly different average number of re-arrests than low-risk offenders. The data from Benny's study is provided below. Use this information to answer questions 1-3.

High-risk offenders Low-risk offenders

n₁ = 36 n₂ = 42

M₁ = 4.3 M₂ = 3.1

s²₁= 2.4 s²₂= 3.0

1. Which of the following correctly reports Benny's 95% confidence interval?

a) .010-2.390

b) .460-1.940

c) -1.552- -.734

d) 1.298 - 4.761

2. How should Benny interpret his confidence interval?

Group of answer choices

a) He's 95% confident the sample mean is within the interval.

b) He's 95% confident the meandifference between these twopopulations is within the interval.

c) He's 95% confident the difference between the sample means is within the interval.

d) He's 95% confident the population mean is within the interval.

3. Using the statistics provided in the instructions for this assignment, calculate, report and interpret the effect size for Benny's data