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Intro to Stat_Part_48

# Intro to Stat_Part_48 - 158 CHAPTER 10 HYPOTHESIS TESTING...

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158 CHAPTER 10. HYPOTHESIS TESTING: TWO MEANS, PAIRED DATA, TWO PROPORTIONS Running time (minutes) Race walking time (minutes) 5.1 7.3 5.6 9.2 6.2 10.4 4.8 6.9 7.1 8.9 4.2 9.5 6.1 9.4 4.4 7.9 Table 10.5 Exercise 10.26 Marketing companies have collected data implying that teenage girls use more ring tones on their cellular phones than teenage boys do. In one particular study of 40 randomly chosen teenage girls and boys (20 of each) with cellular phones, the average number of ring tones for the girls was 3.2 with a standard deviation of 1.5. The average for the boys was 1.7 with a standard deviation of 0.8. Conduct a hypothesis test to determine if the averages are approximately the same or if the girls’ average is higher than the boys’ average. Exercise 10.27 (Solution on p. 167.) While her husband spent 2½ hours picking out new speakers, a statistician decided to determine whether the percent of men who enjoy shopping for electronic equipment is higher than the per- cent of women who enjoy shopping for electronic equipment. The population was Saturday af- ternoon shoppers. Out of 67 men, 24 said they enjoyed the activity. 8 of the 24 women surveyed claimed to enjoy the activity. Interpret the results of the survey. Exercise 10.28 We are interested in whether children’s educational computer software costs less, on average, than children’s entertainment software. 36 educational software titles were randomly picked from a catalog. The average cost was \$31.14 with a standard deviation of \$4.69. 35 entertainment software titles were randomly picked from the same catalog. The average cost was \$33.86 with a standard deviation of \$10.87. Decide whether children’s educational software costs less, on average, than children’s entertainment software. (Source: Educational Resources , December catalog) Exercise 10.29 (Solution on p. 167.) Parents of teenage boys often complain that auto insurance costs more, on average, for teenage boys than for teenage girls. A group of concerned parents examines a random sample of insurance bills. The average annual cost for 36 teenage boys was \$679. For 23 teenage girls, it was \$559. From

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Intro to Stat_Part_48 - 158 CHAPTER 10 HYPOTHESIS TESTING...

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