Question

1. A sample has a mean of 145. The population this sample comes from has a mean of 150 and a standard deviation of 8.

1. Find Cohen’s d.

2. What is the strength of this value? Does this mean that there is a lot of overlap or a small amount of overlap?

2. The average teenager gets 7 hours of physical activity in a given week, with a standard deviation of 0.5. Michelle Obama’s Lets Move! Initiative encourages schools to add more physical activity into the school day. They add additional physical education classes and extra recess activities. 25 students are selected at random and report how many hours of physical activity they had in the last week. The mean is 7.18.

1. Find Cohen’s d.

2. What is the strength of this value? Does this mean that there is a lot of overlap or a small amount of overlap?

Answer 1