When 346 college students are randomly selected and surveyed, it is found that 121 own a car. Construct a 99% confidence interval for the percentage of all college students who own a car.
A)(12.1%, 57.8%)
B)(29.9%, 40.0%)
C)(29.0%, 40.9%)
D)(28.4%, 41.6%)
E)(30.8%, 39.2%)

Question

Quizplus · Accepted Answer

The sample proportion is 121/346. Using the formula for a confidence interval for a proportion and a 99% confidence level, the interval is calculated to be approximately (28.4%, 41.6%).

When 346 College Students Are Randomly Selected and Surveyed, It