Insurance companies conducted a survey in which 1,100 drivers were surveyed. Among those who were surveyed, 814 indicated that careless or aggressive driving was the biggest on the road. 440 respondents said that call phone usage by other drivers was the driving behaviors that annoyed them the most.
- How to construct and interpret a 95% confidence interval estimate for the true proportion in the population of all drivers who are annoyed by cell phone usage.
- How to construct and interpret a 98% confidence interval for the population proportion of all drivers who 814 indicated that careless or aggressive driving was the biggest threat on the road.
- For the first question, what sample size should be used if we want a 99% confidence interval within ( + or - 2%).