The Practice of Statistics, 5e Online Quiz: Chapter 2

The following multiple-choice quiz will test your recall of concepts and facts across the entire chapter. Use the quiz to determine which section of the chapter you need to study more carefully or to verify your mastery of the chapter.

Instructions: Choose the letter of the best answer. When you are finished, select “Submit.”

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1. The cumulative relative frequency graph below describes the distribution of weights (in grams) of tomatoes grown in a laboratory experiment. Which of the following weights is closest to the median of the distribution? *
1 point
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2. For the density curve shown, which of the following statements is true? *
1 point
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3. An office uses two brands of fluorescent light bulbs in its overhead light fixtures.  From past experience, it is known that Brand A bulbs have a mean life length of 3000 hours and a standard deviation of 200 hours, while Brand B bulbs have a mean life length of 2700 hours and a standard deviation of 250 hours.  Which bulb has a longer life relative to all bulbs of its brand, a Brand A bulb that lasts 3150 hours or a Brand B bulb that lasts 2850 hours? *
1 point
4. Javier’s school bus is always late.  Below are data on how many minutes late the bus was for 15 days in February. What is the 60th percentile of this distribution? *
1 point
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5. The weights of cockroaches living in a university dormitory follow a Normal distribution with mean 80 grams and standard deviation 5 grams.  The percentage of cockroaches having weights between 72 grams and 88 grams must be *
1 point
6. Scores on the American College Testing (ACT) college entrance exam follow a Normal distribution with mean 18 and standard deviation 6.  Lisa’s standardized score on the ACT was z = -0.7.  What was her actual ACT score? *
1 point
7. What is the 25th percentile of the standard Normal distribution? *
1 point
8. The lifetime of a 2-volt battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours.  The proportion of batteries with lifetimes that exceed 520 hours is approximately *
1 point
9. The lifetime of a 9-volt battery in constant use has an approximately Normal distribution with a mean of 516 hours and a standard deviation of 20 hours.  Which of the following is the approximate lifetime of a battery that lasts longer than 90% of all batteries? *
1 point
10. The lifetime of 9-volt battery in constant use has an approximately Normal distribution with a mean of 516 hours and a standard deviation of 20 hours.  Which of the following best describes the distribution of standard scores for the lifetimes of such batteries? *
1 point
11. Fuji apples grown at a certain orchard have a mean weight of 5.2 ounces with a standard deviation of 0.8 ounces.  Suppose the scale the orchard owner uses systematically underweighs apples by 0.2 ounces and also weighs the apples in grams, rather than ounces.  What would the mean and standard deviation of these apples’ weights be as determined by this scale?  (Note: 1 ounce ≈ 28 grams). *
1 point
12. The graph below is a Normal probability plot of test scores for students in Mr. Olivier’s precalculus classes.   Based on this plot, which of the following is the best description of the shape of the distribution of test scores? *
1 point
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