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9 May, 10:20

N a study of 250 adults, the mean heart rate was 70 beats per minute. Assume the population of heart rates is known to be approximately normal with a standard deviation of 12 beats per minute. What is the 99% confidence interval for the mean beats per minute?

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  1. 9 May, 10:22
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    We are given mean = 70, SD = 12, sample size n = 250, and for a 99% confidence interval, the two-tailed z-score is + / - 2.58.

    The CI bounds are calculated as:

    mean + / - z*SD/sqrt (n) = 70 + / - 2.58*12/sqrt (250) = 68.04 to 71.96 beats per minute
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