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

Question

2 years ago

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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

Mathematics

2 answers:

prohojiy [21] · Answer 1 · 2022-05-17T00:15:51+03:00

prohojiy [21]2 years ago

7 0

Answer:

the answer is b. 1.10

Step-by-step explanation:

i just took this test, its right

My name is Ann [436] · Answer 2 · 2022-05-16T23:07:56+03:00

Given:
Confidence level = 90%
mean = 71 beats per minute
standard deviation = 6 beats per minute

margin of error = z * δ / √n

where : δ - population of the standard deviation, n is the sample size ; z is the appropriate z value.

90% confidence level = 1.645 in z-value

margin of error = 1.645 * (6/√80) = 1.645 * (6/8.94) = 1.645 * 0.671 = 1.104

The margin of error is 1.10