You want to construct a 99% confidence interval for the proportion of retail stores that went out of business due to the recent pandemic. You managed to collect a random sample of 93 retail stores and found 15% of them shut down permanently. Construct and interpret the confidence interval.

If n=300 and x=60, construct a 99% confidence interval estimate for the population proportion.

You're considering going to graduate school, and you would like to know how many people would recommend it. You talk to 28 people, and 6 recommend it. Construct a 96% confidence interval for p, the proportion of people that recommend you go to graduate school. What is the lower bound of this interval?

Students at a certain college were asked if they have a car. After surveying 601 students, it was found that 40.3% of them have a car. The margin of error was 4% with a 95% confidence level. What does this margin of error tell you about the percentage of students at that college who have a car? We can be 95% confident that somewhere between % and % of the students at that college have a car.

What would answer be at 99% confidence interval?

If a 90%, a 95% and a 99% confidence interval are foung for a population mean, describe how the 3 interval estimates are related to each other. Which of the 3 intervals is most likely to contain the population mean?

A poll of 2500 people shows that 50% approve of a smoking ban in bars and restaurants in Kentucky. What is the margin of error for this confidence interval? (Assume 95% confidence.)

Briefly describe the relationship between confidence interval and hypothesis testing.

Find the margin of error for the​ 99% confidence interval used to estimate the population proportion. In a clinical test with 1200 subjects, 35​% showed improvement from the treatment.

What is the effect on a confidence interval if one decreases both sample size and the level of confidence?