Completing all six steps of hypothesis testing.

A dentist wanted to determine if a relationship existed between childhood fluoride exposure and cavities. She took a sample of adults in her practice and counted how many cavities each person had in his or her permanent teeth. She also determined how many years of childhood each person was exposed to tap water with fluoride. The minimum value on this variable was 0 and the maximum was 18. Here are the data she collected:

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Case Case Case Case Case Case 5 3 10 X (years of 18 12 fluoride) Y (number of cavities) 3 10 4 3. 3. 2.