Concept explainers
In Problems 27–30, (a) construct a histogram for the data using the given number of classes to show that the data are approximately
28. Repeat Exercise 27 for the reaction times of 25 subjects with a zero blood alcohol level:
0.7 | 1.1 | 1.1 | 1.2 | 1.4 | 1.4 | 1.4 | 1.5 | 1.5 |
1.5 | 1.6 | 1.6 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.8 |
t.9 | 1.9 | 2.1 | 2.2 | 2.3 | 2.5 | 2.6 |
27. A researcher is studying reaction times in adult subjects that are alcohol-impaired in an effort to study the effects of impairment on driving. The amount of time 25 randomly selected adults take to react to a stimulus when they have a blood alcohol level of 0.08 was recorded and is displayed below. Use live classes; find the probability that a randomly selected driver with a blood alcohol of 0.08 will lake less than 1.5 seconds Lo react, and the probability that he or she will take between 2 and 4 seconds to react.
1.2 | 1.5 | 1.6 | 1.6 | 1.7 | 1.9 | 2.0 | 2.1 | 2.1 |
2.2 | 2.2 | 2.2 | 2.3 | 2.4 | 2.4 | 2.5 | 2.5 | 2.7 |
2.8 | 2.8 | 2.8 | 3.0 | 3.1 | 3.3 | 3.5 |
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