Having a baby in a U.S. hospital costs $2528, on average. A study of 200 AML (Active Management of Labor) deliveries had a mean cost of $2480 with a standard deviation of $766. At the 5% significance level, do the data provide sufficient evidence to conclude, that on average, AML reduces the cost of having a baby in a U.S. hospital. Determine the null hypothesis?

	A.	Ho: mu =$2480
	B.	Ho: mu = $2528 + $766
	C.	Ho: mu = $2528
	D.	Ho: mu = $2480 + $766

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