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Chapter 2: Q 83. (page 143)

Refrigerators Refer to Exercise 75

a. Use your calculator to make a Normal probability plot of the data. Sketch this graph on your paper.

b. What does the graph in part (a) imply about whether the distribution of refrigerator capacity is approximately Normal? Explain.

Short Answer

Expert verified

Part (a) The graph is

Part (b) Yes.

Step by step solution

01

Part (a) Step 1: Given information

The data set is:

12.913.714.114.214.514.514.614.715.115.2
15.315.315.315.315.515.615.615.81616
16.216.216.316.416.516.616.616.61717
17.217.417.417.918.4




02

Part (a) Step 2: Explanation

The normal probabilities plot can be constructed as

03

Part (b) Step 1: Explanation

All of the points in the above plot are within the boundary, implying that the distribution is essentially normally approximated. As a result, the data can be said to have been collected from a regularly distributed population.

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Watch the salt! Refer to Exercise 55About what percent of the meals

ordered contained between 1200 mg and 1800 mg of sodium?

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a. What proportion of the time does Mrs. Starnes finish an easy Sudoku puzzle in less than 3 minutes?

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c. What percent of easy Sudoku puzzles take Mrs. Starnes between 6 and 8 minutes to complete?

The army reports that the distribution of head circumference among male soldiers is approximately Normal with mean of 22.8inches and standard deviation 1.1inches.

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Measure up Clarence measures the diameter of each tennis ball in a bag with a standard ruler. Unfortunately, he uses the ruler incorrectly so that each of his measurements is 0.2inchtoo large. Clarence鈥檚 data had a mean of 3.2inchesand a standard deviation of 0.1inch (Recall that 1in.=2.54cm)

a. Find the mean of the corrected measurements in centimeters.

b. Calculate the standard deviation of the corrected measurements in centimeters.
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