13-2. A study compared the body weight (in Kg) and the brain weight (in grams) f

Question

13-2. A study compared the body weight (in Kg) and the brain weight (in grams) for a sample of 20 mammals. It was determined that the linear correlation coefficient is 0.099. What is the value of the correlation coefficient indicating?

A. Brain weight and body weight are positively correlated. As body weight increases, brain weight is also increasing.

B. Brain weight and body weight are negatively correlated. As body weight increases, brain weight is decreasing.

C. Brain weight and body weight are not correlated. As body weight increases, brain weight tends to remain the same.

D. Brain weight and body weight are positively correlated. As body weight increases, brain weight is decreasing.

Explanation / Answer

The coefficient of correlation = 0.099 is very close to 0. This indicates that there is no linear association between the two variables.

So the correct option is (C)

Brain weight and body weight are not correlated. As body weight increases, brain weight tends to remain the same.

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