Which one of the following is least likely to have occurred by chance, i.e., has resulted from sampling error?

Question

A) z= -1

B) z= 1.6

C) z= 0.5

D) z= -2.2

Answer 1

Hey Olivia!

The likelihood of sampling error decreases as the value becomes more extreme. You can use the z-score to determine this, since the z-score magnitude of x tells you how many standard deviations x is from the mean. So the largest z-score magnitude (which is D, -2.2) is the most extreme value and least likely to occur by chance.

~Kaleab