corresponding pdf

Normal Q-Q Plot
Histogram of rs
Sample Quantiles
-2 -1 0 1 2
Frequency
0 5 10 15 20
-2 -1 0 1 2
Theoretical Quantiles
-2 -1 0 1 2
rs
n = 100
Normal Q-Q Plot
Histogram of rs
Sample Quantiles
-2 -1 0 1 2 3
Frequency
0 5 10 15 20
-2 -1 0 1 2
Theoretical Quantiles
-2 -1 0 1 2 3
rs
(c) What lesson do you draw about using graphs to asses whether or not a data set follows a normal
distribution
For small n, it is relatively difficult to assess normality. For moderate to large n, the data will
generally follow a normal distribution and the points will follow a straight line in a Q-Q plot.
20