Several years ago a survey showed that the percent of drivers wearing seat belt was 87%....
Several years ago a survey showed that the percent of drivers
wearing seat belt was 87%. A resarcher thought that the percent had
decreased recently and conducted an hypothesis test. The null
hypothesis was rejected. Which of the following is the correct
conclusion?
- There is not sufficient evidence to conclude that the percent of drivers wearing seat belts while driving has decreased
- There is sufficient evidence to conclude that the percent of drivers wearing seat belts has remainde the same.
- This is sufficient evidence to conclude that the precent of drivers wearing seat belts has decreased
- The is not sufficient evidence to conclude that the percent of drivers wearing seat belts has remained the same,
Homework Answers
The null hypothesis is
H0 : P = 0.87
The alternative hypothesis H1 is
H1: P < 0.87
( percentage of drivers wearing seat belt has decreased )
Here the null hypothesis is rejected .
Conclusion : This is sufficient evidence to conclude that the percent of drivers wearing seat belts has decreased.
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