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Chapter 6: Q7 (page 281)

Interpreting Normal Quantile Plots.In Exercises 5鈥�8, examine the normal quantile plot and determine whether the sample data appear to be from a population with a normal distribution.

Dunkin鈥� Donuts Service Times The normal quantile plot represents service times during the dinner hours at Dunkin鈥� Donuts (from Data Set 25 鈥淔ast Food鈥� in Appendix B).

Short Answer

Expert verified

From the given normal quantile plot, it appears that the sample data of service times during the dinner hours at Dunkin鈥� Donuts is not from a population that follows the normal distribution as some points lie far from the straight line.

Step by step solution

01

Given information

The normal quantile plot of the sample data of service times during the dinner hours at Dunkin鈥� Donuts is constructed.

02

Interpretation of the normal quantile plot

If the points on a normal quantile plot appear to form a straight-line pattern, then the sample is said to be taken from a normally distributed population.

Here, there are some points on the plot that lie far from the straight line. These points could be outliers

Therefore, the sample ofservice times during the dinner hours at Dunkin鈥� Donuts does not appear to be from a normally distributed population.

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