The manager of a large department store wonders whether customer satisfaction is independent of age. He randomly selects 100 customers and asks them how satisfied they are. He categorizes (or, classifies) the customers by the age of the customer (teenager, young adult, adult, or senior citizen) and by their level of satisfaction (not at all, a little, mostly, or completely satisfied). Suppose he fails to reject his null hypothesis.

Fill in the blanks so as best to express the conclusion of his test: There is

[ Select ]

["

sufficient

", "

insufficient

", "

independent of

", "

not independent of

"] evidence to conclude that the age of a customer is

[ Select ]

["

sufficient

", "

insufficient

", "

independent of

", "

not independent of

"] their level of satisfaction.