CHAPTER 2 Chapter Quick Quiz 81 P-Values In Exercises 13–16, write a statement that interprets the P-value and includes a conclusion about linear correlation. 13. Using the data from Exercise 5 “Forecast and Actual Temperatures,” the P-value is 0.166. 14. Using the data from Exercise 6 “Airport Data Speeds,” the P-value is 0.003. 15. Using the data from Exercise 7 “Cigarette Tar and Nicotine,” the P-value is 0.000. 16. Using the data from Exercise 8 “Pulse Rates,” the P-value is 0.835. 2-4 Beyond the Basics 1.Tornado Alley Refer to the accompanying frequency distribution that summarizes the number of tornadoes in Oklahoma in each year for the past several years. What is the class width? Is it possible to identify the original data values? 2.Tornado Alley Using the same frequency distribution from Exercise 1, identify the class limits of the first class and the class boundaries of the first class. 3.Tornado Alley Using the same frequency distribution from Exercise 1, how many years are included? 4. Tornado Alley Construct the relative frequency distribution corresponding to the frequency distribution in Exercise 1. 5.Tornado Alley A stemplot of the same data summarized in Exercise 1 is created, and one of the rows of that stemplot is 3 | 000144669. Identify the values represented by that row of the stemplot. 6. Computers As a quality control manager at Texas Instruments, you find that defective calculators have various causes, including worn machinery, human error, bad supplies, and packaging mistreatment. Which of the following graphs would be best for describing the causes of defects: histogram; scatterplot; Pareto chart; dotplot; pie chart? 7.Health Test In an investigation of a relationship between systolic blood pressure and diastolic blood pressure of adult females, which of the following graphs is most helpful: histogram; pie chart; scatterplot; stemplot; dotplot? 8. Lottery In Florida’s Play 4 lottery game, four digits between 0 and 9 inclusive are randomly selected each day. We normally expect that each of the 10 different digits will occur about 1>10 of the time, and an analysis of last year’s results shows that this did happen. Because the results are what we normally expect, is it correct to say that the distribution of selected digits is a normal distribution? 9. Seatbelts The Beams Seatbelts company manufactures—well, you know. When a sample of seatbelts is tested for breaking point (measured in kilograms), the sample data are explored. Identify the important characteristic of data that is missing from this list: center, distribution, outliers, changing characteristics over time. 10.Normal Distribution If the following data are randomly selected, which are expected to have a normal distribution? a. Weights of Reese’s Peanut Butter Cups b. Numbers selected in the Florida Pick 4 lottery, in which four whole numbers between 0 and 9 inclusive are randomly selected in each lottery c. Numbers that turn up when a fair die is rolled d. Exact volumes of Coke in 12 oz cans e. Weights of McIntosh apples harvested from the same orchard Chapter Quick Quiz Annual Tornadoes in Oklahoma Frequency (Number of Years) 0–19 3 20–39 18 40–59 21 60–79 15 80–99 6 100–119 5 120–139 0 140–159 1
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