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The resting heart rates for 80 women aged 46–55 in a simple random sample are normally distributed, with a mean of 71 beats per minute and a standard deviation of 6 beats per minute. Assuming a 90% confidence level, what is the margin of error for the population mean?


0.66

1.10

1.31

1.73

Verified Answer :

The margin of error can be calculated using the formula:

1. ME = critical value standard deviation / sqrt(sample size)
2. ME = critical value standard error

Since we are given the standard deviation and the sample size, we can use equation 1. The critical value is always fixed and can be determined using a t or z graph. For 90% confidence level, the CV is 1.645.

ME = 1.645(6)/sqrt80 = 1.1

Answer:

b. 1.10

Step-by-step explanation:

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