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Chapter 2: Q3 (page 75)
Cookies Using the same frequency distribution from Exercise 1, how many cookies are included?
Chocolate Chips | Frequency |
18-20 | 6 |
21-23 | 11 |
24-26 | 18 |
27-29 | 4 |
30-31 | 1 |
The total number of cookies included in the given distribution is equal to 40.
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Deceptive Graphs. In Exercises 17–20, identify how the graph is deceptive.
Self-Driving Vehicles In a survey of adults, subjects were asked if they felt comfortable being in a self-driving vehicle. The accompanying graph depicts the results (based on data from TE Connectivity).
P-Values In Exercises 13–16, write a statement that interprets the P-value and includes a conclusion about linear correlation.
Using the data from Exercise 5 “Brain Volume and IQ,” the P-value is 0.839.
Interpreting a Histogram. In Exercises 5–8, answer the questions by referring to the following Minitab-generated histogram, which depicts the weights (grams) of all quarters listed in Data Set 29 “Coin Weights” in Appendix B. (Grams are actually units of mass and the values shown on the horizontal scale are rounded.)
Class Width and Class Limits Give the approximate values of the class width, and the lower and upper class limits of the class depicted in the bar farthest to the left.
Deceptive Graphs. In Exercises 17–20, identify how the graph is deceptive.
Subway Fare In 1986, the New York City subway fare cost \(1, and as of this writing, the current cost is \)2.50, so the 1986 price was multiplied by 2.5. In the accompanying graph, the large bill is 2.5 times as tall and 2.5 times as wide as the smaller bill.
Linear Correlation Coefficient In Exercises 9–12, the linear correlation coefficient r is provided. Use Table 2-11 on page 71 to find the critical values of r. Based on a comparison of the linear correlation coefficient r and the critical values, what do you conclude about a linear correlation?
Using the data from Exercise 5 “Brain Volume and IQ,” the linear correlation coefficient is r = 0.127.
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