The CEO of a company wants to estimate the percent of employees that use company computers to go on Facebook during work hours with 95% confidence. He selects a random sample of 150 of the employees and finds that 53 of them logged onto Facebook that day. What is the estimate of the standard error of the proportion ?

A group of marketing students at a large university wants to determine the proportion of first year students who use certain types of social media. The students want their estimate to be within 0.03 of the true proportion with a 95% level of confidence. Two years ago, a similar study determined the proportion to be 0.796. How large of a sample is required?

A simple random sample of size 300 was taken from the population of all manufacturing establishments in a certain state: 11 establishments in the sample had 100 employees or more. Estimate the percentage of manufacturing establishments with 100 employees or more.5 Attach a standard error to the estimate.

A new airline has just expanded its network to Australia and is interested in determining the proportion of its Australian customers who are flying overseas for business.  Based on its experience in other markets, the airline estimates that the population proportion is 30%. It wants its confidence level to be 98%, and the error to be within 5%. How many random customers should the airline survey?

Researchers surveyed 1,150 high school students in CA to estimate the proportion of all high school students who vape. 368 of the surveyed students said they do vape. What is the margin of error of the 95% confidence interval?

A certain company's IT department has found that 18% of all visitors to the company website arrive there in error. (They are actually looking for another website.) If this percentage is correct, what is the probability that, in a random sample of 6 visitors to the website, exactly 1 arrives in error?Round your answer to three decimal places.