A researcher wants to know if babies born to mothers exposed to second hand smoke are smaller than the average for the general population, known to be 3389 grams. The null hypothesis is: H0: Mu=3389.

A random sample of 400 medical records was selected from pregnant non-smoking women exposed to second hand smoke. The average birth weight of babies from this sample was 3280 with a standard deviation of 730. The 95%confidence interval for the mean birth weight of babies exposed to second hand smoke is (3208,3352). What do you conclude?

	A.	The one sample t-statistic and p-value are needed to make a conclusion.
	B.	Mothers had lower birth weight babies because of exposure to second hand smoke
	C.	Reject the null hypothesis and conclude that babies exposed to second hand smoke had a lower birth weight on average than general population birth weight.
	D.	Fail to reject the null hypothesis and conclude the smoke exposed infants did not differ in their mean birthweight.