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What is the margin of error

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Average heart rate for Americans is 72 beats/minute. A group of 18 individuals participated in an aerobics fitness program at American Kickboxing of New York to lower their heart rate. After six months, there was evaluation conducted on the group to identify if the program had significantly slowed their heart. The mean heart rate for the group was 69 beats/minute with a standard deviation of 6.5. You need to construct a 95% confidence interval for the mean of all such heart rate levels to determine if the aerobics program was effective in lowering heart rate. What is the margin of error?

a. 0

b. 1.53

c. 3.23

d. 8.49

e. 2.11

Reference no: EM132197951

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