Suppose we have plotted some data on a normal probability pl

Suppose we have plotted some data on a normal probability plot. Which of the following patterns would you look for in this plot to determine if the data follow (at least approximately) a normal distribution?

   A.  
If the data plot approximately along a straight line.

   B.  
If the data appear in a circular fashion.

   C.  
If the data increase, then decrease, then increase again in a wavy fashion.

   D.  
If the data plot along a bell curve.

Solution

It is

OPTION A: If the data plot approximately along a straight line. [ANSWER]

This is because the relationship between an observation and its z score must be linear, with slope 1/(standard deviation).