In ____ of the cases,the mean of a sample selected by EPSEM will be more than$\pm$ 3 Z's from the population mean.
A)less than 1%
B)more than 5%
C)more than 90%
D)more than 99%

Question

Quizplus · Accepted Answer

EPSEM stands for "Equal Probability of Selection Method." This means that each individual in the population has an equal chance of being selected for the sample. Therefore, the sample mean will be representative of the population mean. According to the Empirical Rule, 99.7% of the data falls within 3 standard deviations of the mean. Therefore, the probability of the mean of a sample selected by EPSEM being more than 3 standard deviations from the population mean is less than 1%.

In ____ of the Cases,the Mean of a Sample Selected ±\pm±

In ____ of the Cases,the Mean of a Sample Selected $\pm$