According to a certain government agency for a large country, the proportion of fatal traffic accidents in the country in which the driver had a positive blood alcohol concentration (BAC) is 0.34. Suppose a random sample of 109 traffic fatalities in a certain region results in 49 that involved a positive BAC. Does the sample evidence suggest that the region has a higher proportion of traffic fatalities involving a positive BAC than the country at the a = 0.01 level of significance?
According to a certain government agency for a large country, the proportion of fatal traffic accidents in the country in which the driver had a positive blood alcohol concentration (BAC) is 0.34. Suppose a random sample of 109 traffic fatalities in a certain region results in 49 that involved a positive BAC. Does the sample evidence suggest that the region has a higher proportion of traffic fatalities involving a positive BAC than the country at the a = 0.01 level of significance?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Transcribed Image Text:**Hypothesis Testing for Proportion of Fatal Traffic Accidents with Positive BAC**
According to a government agency, the nationwide proportion of fatal traffic accidents where the driver had a positive blood alcohol concentration (BAC) is 0.34. We examine a random sample of 109 traffic fatalities in a region, where 49 involve a positive BAC. We aim to determine if there is evidence suggesting that the region has a higher proportion of traffic fatalities with a positive BAC than the national level, at a significance level of α = 0.01.
**Steps:**
1. **Check Requirements:**
Ensure the sample size is sufficient with np₀(1 − p₀) ≥ 10 and that the sample size is less than 5% of the population.
2. **Formulate Hypotheses:**
- Null Hypothesis (H₀): p = 0.34
- Alternative Hypothesis (H₁): p > 0.34
3. **Compute the Test Statistic (z₀):**
Calculate the z-value for the sample proportion.
4. **Find the P-value:**
Determine the P-value from the z₀ statistic.
5. **Conclusion:**
- Option A suggests rejecting the null hypothesis if the P-value < α, indicating sufficient evidence for a higher regional proportion of fatalities with positive BAC.
- Option B suggests rejecting the null hypothesis if the P-value > α, although this option seems unlikely in context.
Make your choice based on the calculated P-value and the significance level α.
**Note for Students:** Fill in each step with calculated values for complete analysis. Make sure to round to the required decimal places as instructed.

Transcribed Image Text:**Determine the conclusion for this hypothesis test. Choose the correct answer below.**
- **A.** Since P-value < α, reject the null hypothesis and conclude that there is sufficient evidence that the region has a higher proportion of traffic fatalities involving a positive BAC than the country.
- **B.** Since P-value > α, reject the null hypothesis and conclude that there is sufficient evidence that the region has a higher proportion of traffic fatalities involving a positive BAC than the country.
- **C.** Since P-value < α, do not reject the null hypothesis and conclude that there is not sufficient evidence that the region has a higher proportion of traffic fatalities involving a positive BAC than the country.
- **D.** Since P-value > α, do not reject the null hypothesis and conclude that there is not sufficient evidence that the region has a higher proportion of traffic fatalities involving a positive BAC than the country.
*Note: No graphs or diagrams are included in this image.*
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