Question: A researcher conducts a well-designed study to compare a sample mean to a known population mean and uses alpha=.05, two-tailed.She finds a z-test of 1.98,

A researcher conducts a well-designed study to compare a sample mean to a known population mean and uses alpha=.05, two-tailed.She finds a z-test of 1.98, p-value=.048.What should she conclude?

a.The 95% confidence interval of the z-statistic will contain zero

b.The conclusion cannot be made without knowing the direction of the alternative hypothesis

c.Data support the alternative hypothesis

d.She fails to reject the null hypothesis

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