An expimenter wants to know if listening to classical music will help people to solve more math problems. The expimenter has a group of people come in for the study in the morning, and plays them classical music while they solve math problems. The expimenter then has a group of people come in for the study in the afternoon, and has them solve math problems with no music playing. What did the expimenter fail to do

to provide common conditions of research

Explanation:

In simple words, the common conditions of research must be provided when that particular condition can be a distorting factor to the results obtained. In the given case, the two subjects groups were tested on two different times. There is a high chance that the morning group would have performed better than the afternoon ones.

Hence, it will be seen as a failure of the experimenter to test the groups in two different times.

is this supposed to be a question

if you have to make a general question and respond to your thoughts, then this isn't really a question someone can you on. read the passage, form your question, and answer using your thoughts. no one else can understand how you interpreted this text if you don't tell us.