A baseball enthusiast believes pitchers who strike out a lot of batters also walk a lot of batters.He reached this conclusion by going to the library and examining the records of all major league pitchers between 1990 and 1995.What type of study is his decision based on?
A)Anecdotal evidence
B)An observational study based on available data
C)An observational study based on a sample survey
D)An experiment

Question

Quizplus · Accepted Answer

The enthusiast's decision is based on an observational study because he is examining data that already exists rather than collecting new data himself. It is based on available data because he went to the library to examine the records of major league pitchers between a specific time period. It is not an anecdotal evidence because it is based on actual data and not just personal experiences or stories. It is also not an experiment because he did not manipulate any variables and only observed existing data.

A Baseball Enthusiast Believes Pitchers Who Strike Out a Lot