Question

For a random sample of 9 women, the average resting pulse rate is x = 76 beats per minute, and the sample standard deviation is s = 5. The standard error of the sample mean is____________
a. 0.557

b. 2.778

c. 0.745

d. 1.667

Answer 1

For a sample of 9 women, the average resting pulse rate is x=76 beats per minute, and the sample standard deviation is s=5.

The standard error of the sample mean is given by

Where, s is the standard deviation; and n is the sample size.

The standard error of the sample mean is

So, the standard error of the sample mean is option (d) 1.667.