A coach wants to know who his fastest runner is.
He should conduct an experiment and make all his students run a 100m race to find out who is his fastest runner.
A coach wants to know how many hours each member of the team gets before a meet.
He should conduct an observational study and take note of the time for each member for one week. He can then generalize his data for whichever period he wants.
A coach wants to know the effect of drinking a certain sports drink during an intense practice.
He should, again, conduct an observational study. He should divide his students into two groups and give the drink to one of the group and note the changes in their performance.
A coach wants to know how losing affects the team.
For this, he should conduct a survey. He should ask other coaches about the impacts of loss on their students and also study his students if they lose a match.
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