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Chapter 6: Q7 (page 281)

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

Dunkin’ Donuts Service Times The normal quantile plot represents service times during the dinner hours at Dunkin’ Donuts (from Data Set 25 “Fast Food” 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’ 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’ 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’ Donuts does not appear to be from a normally distributed population.

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Most popular questions from this chapter

Sampling with Replacement The Orangetown Medical Research Center randomly selects 100 births in the United States each day, and the proportion of boys is recorded for each sample.

a. Do you think the births are randomly selected with replacement or without replacement?

b. Give two reasons why statistical methods tend to be based on the assumption that sampling is conducted with replacement, instead of without replacement.

Standard normal distribution, assume that a randomly selected subject is given a bone density test. Those test scores are normally distributed with a mean of 0 and a standard deviation of 1. In each case, Draw a graph, then find the probability of the given bone density test score. If using technology instead of Table A-2, round answers to four decimal places.

Less than 0

In Exercises 5–8, find the area of the shaded region. The graphs depict IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler IQ test).

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Between 2.5 minutes and 4.5 minutes

Standard normal distribution. In Exercise 17-36, assume that a randomly selected subject is given a bone density test. Those test scores are normally distributed with a mean of 0 and a standard deviation of 1.In each case, Draw a graph, then find the probability of the given bone density test score. If using technology instead of Table A-2, round answers to four decimal places.

Less than -1.23
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