If the correlation between the number of times 32 people brush their teeth per d

Question

If the correlation between the number of times 32 people brush their teeth per day and the number of cavities in their mouths is -.20, indicate whether each of the Explain why you think each of the following inferences is correct or incorrect.


People with fewer cavities need to brush more. Correct inference Incorrect inference


Brushing teeth helps to reduce cavities. Correct inference /Incorrect inference



Brushing teeth and having cavities are significantly inversely related.
Correct inference /Incorrect inference



The majority of people with cavities brush their teeth.
Correct inference /Incorrect inference



None of the above is necessarily true.
Correct inference /Incorrect inference

Explanation / Answer

Given that the correlation between the number of times 32 people brush their teeth per day and the number of cavities in their mouths is -0.20 here r = -0.20 so, we conclude that the number of times 32 people brush their teeth per day and the number of cavities in their mouths are negatively correlated. which means there is inverse relationship exist between them. ? People with fewer cavities need to brush more.     It's the correct inference for the given information.

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