1. What was the average annual home run record in the five years before steroid testing started?

2. What was the average annual home run record the five years after steroid testing started?

3. What do you think the data suggests about the effect of steroids on batting? Explain, and make sure you state your evidence.

Unclear question. However, I inferred you are referring to page 58 of the article "This Week: Who is Responsible for Doping in Professional Team Sport".

Answer:

1. 63

2. 51. 6

3. Steroids aided performance

Explanation:

1. We get the average annual home run record before steroid testing by summing the home run record 1998-2002 and divide by 5 years which = 315/5 = 63.

2. We get the average annual home run record after testing began by summing the home run record 2003-2007 and divide by 5 years which = 258/5 = 51.6

3. The data shows a decline of about 18% (51.6/63 * 100 - 100 = - 18.09%) in annual home runs after testing began, leading to a conclusion that steroids aided performance.