Which of the following is not a method used for determining whether data are from an approximately normal distribution?
A) Find the interquartile range, $\mathrm { IQR }$, and standard deviation, $s$, for the sample. Then $\frac { \mathrm { IQR } } { s } \approx 1.3$.
B) Compute the intervals $\bar { x } \pm s , \bar { x } \pm 2 s$, and $\bar { x } \pm 3 s$. The percentages of measurements falling in each should be approximately $68 \% , 95 \%$, and $100 \%$ respectively.
C) Construct a histogram or stem-and-leaf display. The shape of the graph or display should be uniform (evenly distributed).
D) Construct a normal probability plot. The points should fall approximately on a straight line.

Question

Which of the following is not a method used for determining whether data are from an approximately normal distribution? 
A) Find the interquartile range, $\mathrm { IQR }$, and standard deviation, $s$, for the sample. Then $\frac { \mathrm { IQR } } { s } \approx 1.3$.
B) Compute the intervals $\bar { x } \pm s , \bar { x } \pm 2 s$, and $\bar { x } \pm 3 s$. The percentages of measurements falling in each should be approximately $68 \% , 95 \%$, and $100 \%$ respectively.
C) Construct a histogram or stem-and-leaf display. The shape of the graph or display should be uniform (evenly distributed).
D) Construct a normal probability plot. The points should fall approximately on a straight line.

Quizplus · Accepted Answer

A uniform distribution is not indicative of a normal distribution; a normal distribution should be bell-shaped.

Which of the Following Is Not a Method Used for Determining