In order to estimate the standard error of the difference between the means, one

Question

In order to estimate the standard error of the difference between the means, one must have _____.

a. the sample means

b. the sample variances

c. the population means

d. the population variances

Kay examined the relation between the amount of exercise and body fat. She found that people who exercise much have a low proportion of body fat whereas those who exercise little have a high proportion of body fat. Kay has provided evidence of _____.

a. a positive correlation

b. a negative correlation

c. a cause and effect relation between exercise and fat

d. no meaningful relation between exercise and fat

e. these data cannot be interpreted

Explanation / Answer

In order to estimate the standard error of the difference between the means, one must have the population variances. Kay examined the relation between the amount of exercise and body fat. She found that people who exercise much have a low proportion of body fat whereas those who exercise little have a high proportion of body fat. Kay has provided evidence of a cause and effect relation between exercise and fat

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