When a group of 16 men enrolled in a cardiac fitness program, their mean weight

Question

When a group of 16 men enrolled in a cardiac fitness program, their mean weight was 200 lbs, with a standard deviation=20lbs and standard error of the mean=5 lbs. Into which range would the weights of about 95% of the men fall?

a. 195-205 lbs

b. 190-210 lbs

c. 180-220 lbs

d. 160-240 lbs

If these 16 men were a random sample of all men enrolling in a cardiac fitness program, we could say with 95% confidence that mean weight of all such men was within the range of

a. 195-205 lbs

b. 190-210 lbs

c. 180-220 lbs

d. 160-240 lbs

Explanation / Answer

The 95% interval is:

( - 1.96*/n , + 1.96*/n)

- 1.96*/n = 200 - 1.96*5 = 190.2

+ 1.96*/n = 200 + 1.96*5 = 209.8

answer b.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.