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A medical researcher is investigating the effect of drinking coffee on systolic blood pressure. The researcher assumes the average systolic blood pressure is 120 mmHg. For a random sample of 200 patients, the researcher takes two measurements of systolic blood pressure. The first systolic blood pressure measurement is taken during a week when the patients drink no coffee, and the second systolic blood pressure measurement is taken during a week when the patients drink at least two cups of coffee. The medical researcher wonders whether there is a significant difference between the blood pressure measurements.
Which of the following is the correct null and alternative hypothesis for the medical researcher's study?
Group of answer choices
A) Ho: μ = 120 ; H a : μ ≠ 120
B) H 0 : μ = 0 ; H a : μ: ≠ 120
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