Concept explainers
Handedness and Cell Phone Use The accompanying table is from a study conducted with the stated objective of addressing cell phone safety by understanding why we use a particular car for cell phone use. (See “Hemispheric Dominance and Cell Phone Use,” by Seidman, Siegel, Shah, and Bowyer, JAMA Otolaryngology—Head & Neck Surgery, Vol. 139, No. 5.) The goal was to determine whether the ear choice is associated with auditory or language brain hemispheric dominance. Assume that we want to test the claim that handedness and cell phone car preference are independent of each other.
a. Use the data in the table to find the expected value for the cell that has an observed frequency of 3. Round the result to three decimal places.
b. What does the expected value indicate about the requirements for the hypothesis test?
Ear Preference for Cell Phone Use
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Elementary Statistics (13th Edition)
- Urban Travel Times Population of cities and driving times are related, as shown in the accompanying table, which shows the 1960 population N, in thousands, for several cities, together with the average time T, in minutes, sent by residents driving to work. City Population N Driving time T Los Angeles 6489 16.8 Pittsburgh 1804 12.6 Washington 1808 14.3 Hutchinson 38 6.1 Nashville 347 10.8 Tallahassee 48 7.3 An analysis of these data, along with data from 17 other cities in the United States and Canada, led to a power model of average driving time as a function of population. a Construct a power model of driving time in minutes as a function of population measured in thousands b Is average driving time in Pittsburgh more or less than would be expected from its population? c If you wish to move to a smaller city to reduce your average driving time to work by 25, how much smaller should the city be?arrow_forwardWhat is meant by the sample space of an experiment?arrow_forwarda. Data Set 9 in Appendix B includes a sample of 35 movies, and 12 of them have ratings of R. What percentage of these 35 movies have R ratings?b. In a study of 4544 students in grades 5 through 8, it was found that 18% had tried smoking (based on data from “Relation between Parental Restrictions on Movies and Adolescent Use of Tobacco and Alcohol,” by Dalton et al., Effective Clinical Practice, Vol. 5, No. 1). How many of the 4544 students tried smoking?arrow_forward
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