You are comparing a sample average to a population average.A Z-score of at least ________ is needed in order to conclude that the observed difference between the two averages is real and meaningful and not due to chance.
A).05
B)1.01
C)1.96
D)2.56

Question

Quizplus · Accepted Answer

A Z-score of 1.96 corresponds to a significance level of 0.05, which is the commonly accepted threshold for statistical significance. This means that if the Z-score is greater than 1.96, we can reject the null hypothesis (that the difference between sample and population averages is due to chance) and conclude that the difference is statistically significant.

You Are Comparing a Sample Average to a Population Average