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In: Statistics and Probability

In a study of heart surgery, one issue was the effect of drugs called beta-blockers on...

In a study of heart surgery, one issue was the effect of drugs called beta-blockers on the pulse

rate of patients during surgery. The available subjects were divided at random into two groups of

40 patients each. One group received a beta-blocker; the other group received a placebo. The

pulse rate of each patient at a critical point during the operation was recorded. The treatment

group had a mean pulse rate of 57 and standard deviation 7. For the control group, the mean

pulse rate was 60 and the standard deviation was 5.

(a) Construct and interpret a 93% confidence interval for the difference in mean pulse rates.

(b) Perform the 5 steps of Hypothesis Testing.

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orchestra answered 1 year ago
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