NOTE: ALL of the questions in this Prelab refer to the following experiment, designed to test whether fruit flies prefer certain species of fruit: 

Experiment: Three flies are placed in a cage with a fresh banana and a rotten apple. Researchers record where the flies seem to spend most of their time. 

Which of the following is correct? 

• Testing three different flies is a good idea, as it will give more confidence in the results.
• Testing 3 flies is adequate, as larger sample sizes are expensive to obtain and test.
• A sample size of three is not enough to be convincing--the three individuals could be unusual.