Suppose that a Normal model describes the acidity (pH) of rainwater, and that water tested after
Last week's storm had a z-score of 1.8. This means that the acidity of that rain …
A) had a pH 1.8 times that of average rainwater.
B) varied with a standard deviation of 1.8.
C) had a pH 1.8 higher than average rainfall.
D) had a pH of 1.8.
E) had a pH 1.8 standard deviations higher than that of average rainwater.

Question

Quizplus · Accepted Answer

A z-score of 1.8 indicates that the pH of the rainwater was 1.8 standard deviations above the mean pH of average rainwater.

Suppose That a Normal Model Describes the Acidity (PH) of Rainwater