Refer to Exercise 16. Do the data represent a random sample? Explain why or why not.
In exercise
The owner of a drugstore is wondering whether the amount of a customer's purchase varies by age group. The owner runs a contest with a grand prize of a $100 gift certificate that can be used in the store. The entry ballot requires the entrant to record his/her age group, and the amount of his/her most recent purchase. The owner selects a random sample of the ballots from the contest. Does it appear that the conditions for ANOVA are met?