Posted by **Katie** on Friday, November 8, 2013 at 7:21pm.

A researcher performs a hypothesis test to test the claim that among girls aged 9-10, the mean score on a particular aptitude test differs from 72, which is the mean score for boys of the same age. Data were collected from a random sample of 43 girls aged 9-10 years and the 95% confidence interval for the girls' aptitude test score is (68.3, 71.8)

Does the confidence interval support the researcher's claim that the girls' mean score differs from the boys' mean score?

A) No, since the confidence interval does not include 72 we can say that we have insufficient evidence that the girls' mean score differs from the boys.

B) Yes, since the confidence interval does not include 72 we can say that we have evidence that the girls' mean score differs from the boys..

C) No, since the confidence interval does not include 72 we can say that we have sufficient evidence that the girls' mean score differs from the boys.

D) Yes, since the interval is so narrow we are certain that the girls score differently from the boys.

E) There is insufficient information to draw a conclusion.

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