The percent body fat in a random sample of 36 men aged 20 to 29 has a sample mean of 14.42. find a 99% confidence interval for the mean percent body fat in all men aged 20 to 29. assume that percent body fat follows a normal distribution, with a standard deviation of 6.95.
a) (0.8, 28.04)b) (12.15, 16.69)c) (12.51, 16.33)d) (12.07, 16.77)

Step-by-step explanation:

The confidence interval for population mean is given by :-

Given : Sample size :

Sample mean :

Standard deviation :

Significance level :

Critical value :

Now, the 99% confidence interval for the mean percent body fat in all men aged 20 to 29 will be :-

answer:

c) the x-coordinate of the center of the circle increases by 3