Explanation Given: Danner and Phillips (2008) report the results from a county-wide study showing that delaying high school start times by one hour significantly reduced the motor vehicle crash rate for teen drivers in the study. Suppose that the researchers monitored 500 student drivers for 1 year after the start time was delayed and found that 45 were involved in automobile accidents. Before delaying the start time, the accident rate was 12%. Calculations: H 0 : p = .12 , H 1 : p ≠ 0.12 , p ^ = 45 / 500 = .09 Z = ( p ^ − p ) p × q / n = ( 0.09 − 0.12 ) 0.12 × ( 1 − 0.12 ) / 500 = − 2.0643 Z t a b u l a t e d , 0.05 = − 1.96 Z c a l c u l a t e d < Z t a b u l a t e d (for left side in acceptance region)

Statistics for The Behavioral Sciences (MindTap Course List)

10th Edition

ISBN: 9781305504912

Author: Frederick J Gravetter, Larry B. Wallnau

Publisher: Cengage Learning

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Chapter 18, Problem 9P

To determine

a. Whether these results indicate a significant change in the accident rate using binomial test, following the change in school start time using a two-tailed test with α=0.05 .

b. Because the outcome of the binomial test is a borderline z-score, use the real limits for X = 45 to determine if the entire z-score interval is located in the critical region. If any part of the interval is not in the critical region, the correct decision is to fail to reject the null hypothesis.

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Chapter 18 Solutions

Statistics for The Behavioral Sciences (MindTap Course List)

Ch. 18 - 1. Insurance companies charge young drivers more...Ch. 18 - 2. Güven, Elaimis, Binokay, and Tan (2003) studied...Ch. 18 - In problem 9 in Chapter 17, we described a study...Ch. 18 - 4. Problems 5 and 6 in Chapter 17 cited a study...Ch. 18 - 5. A researcher would like to determine whether...Ch. 18 - 6. A recent survey of practicing psychotherapists...Ch. 18 - 7. In 2005, Fung et al. published a study...Ch. 18 - 8. In problem 13 in Chapter 9, wepresented a study...Ch. 18 - Prob. 9P Ch. 18 - Prob. 10P

Ch. 18 - Prob. 11P Ch. 18 - 12. One of the original methods for testing ESP...Ch. 18 - Prob. 13P Ch. 18 - Prob. 14P Ch. 18 - 15. In Example 11.2 (p. 343) we presented a...Ch. 18 - Stressful or traumatic experiences can often...Ch. 18 - Prob. 17P Ch. 18 - Prob. 18P Ch. 18 - Prob. 19P Ch. 18 - In Problem 14 in Chapter 11, we described a study...Ch. 18 - In problem 13 in Chapter 17, we Discussed a study...Ch. 18 - Prob. 22P Ch. 18 - Prob. 23P Ch. 18 - Prob. 24P Ch. 18 - Prob. 25P

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