A researcher conducts a well-designed study to compare a sample mean to a known population mean and uses alpha=.05, one-tailed. She finds a z-test of -2.5. What should she conclude?

	A.	The conclusion cannot be made without knowing the direction of the alternative hypothesis
	B.	Data support the alternative hypothesis
	C.	The 95% confidence interval of z will contain zero
	D.	She fails to reject the null hypothesis