An SRS of 18 recent birth records at the local hospital was selected. In the sample, the average birth weight was 119.6 ounces and the standard deviation was 6.5 ounces. Assume that the population of birth weights of all babies born in this hospital follow a Normal distribution, with mean μ.
The standard error of the mean is
A. 6.50.
B. 1.53.
C. 0.36.
D. 0.02.