Question: To study whether there is a correlation between playing a musical instrument and grades, a teacher randomly selected 20 students who play an instrument and

To study whether there is a correlation between playing a musical instrument and grades, a teacher randomly selected 20 students who play an instrument and 20 students who do not play an instrument, and compared their grades. Is the study observational or experimental? If it is an experiment, what is the controlled factor

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4. Most people get upset with a person who disagrees with them.

9. If you disagree with someone in a group, it is usually better to keep quiet than to get the group off-track with your personal difference of opinion.

3. The best way to handle a conflict is simply to let everyone cool off.