Random samples of size 49 are taken from an infinite population whose mean is 300 and standard deviation is 21.The mean and standard error of the sample mean,respectively,are:

A) 300 and 21
B) 300 and 3
C) 300 and 0.43
D) None of these choices.

Standard Error

The standard deviation of the sampling distribution of a statistic, most commonly the mean; it is used to estimate the efficiency, accuracy, or precision of a sample-based estimate.

Sample Mean

The average value of a sample set of numbers, calculated by adding all the values together and dividing by the number of values.