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A researcher studying stress is interested in the blood pressure measurements of chief executive officers (CEOs) of major corporations. He believes that the mean systolic blood pressure, , of CEOs of major corporations is less than mm Hg, which is the value reported in a possibly outdated journal article. He plans to perform a statistical test. He measures the systolic blood pressures of a random sample of CEOs of major corporations and finds the mean of the sample to be mm Hg and the standard deviation of the sample to be mm Hg.
Questions.
What are the null hypothesis (H0) and the alternative hypothesis (
H1) that should be used for the test?
In the context of this testm what is a Type I error
Suppose that the researcher decides to reject the null hypothesis. What sort of error might he be making?
