An infinite population has a mean of 40 and a standard deviation of 15.A sample of size 100 is taken at random from this population.The standard error of the sample mean equals:

A) 15
B) 15/√100
C) 15/100
D) None of these choices.

Infinite Population

A theoretical concept where the population size is considered limitless for practical statistical purposes.

Standard Deviation

A measure of the dispersion or spread of a set of numbers, indicating how much deviation exists from the mean of the dataset.

Standard Error

Standard error measures the accuracy with which a sample distribution represents a population, using the standard deviation of the sample means.