At one large college, 660 out of the 1500 students surveyed said they plan to take another science class. Find the 95% confidence interval for the proportion of students that said they plan to take another science class

Twenty years ago, a very famous psychologist specializing in marriage counseling authored a book detailing the way in which she believed spouses should communicate. She is now interested in the proportion of all couples who bought her book who stayed together. For a random sample of 275 couples who bought her book, she found that 217 of them stayed together. Based on this, compute a 90% confidence interval for the proportion of all couples who bought her book who stayed together. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. (If necessary, consult a list of formulas.) What is the lower limit of the  90%  confidence interval?   What is the upper limit of the  90%  confidence interval?

In a survey of 2013 adults in a recent​ year, 731 made a New​ Year's resolution to eat healthier.   Construct​ 90% and​ 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals.

Of 300 randomly selected medical students, 30 said that they planned to work in a rural community.  Find 90% confidence interval for the true proportion of all medical students who plan to work in a rural community. The answers below represent approximate values.