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In order to determine the true mean pulse rate of New York citizens you take a sample of 36 and the sample mean is 72

In order to determine the true mean pulse rate of New York citizens you take a sample of 36 and the sample mean is 72 with a standard deviation of 9 beats per minuete. Based on this data, the 95% confidence interval for the true mean pulse rate of New York Citizens is 72 plus or minus ___________

a. 4,41

b 0.49

c 2.94

d. 3.20

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