f a Random Sample of 450 adults includes 155 who identify as happy, compute an 80% confidence interval for the true proportion of adults who are happy.

Of 254 randomly selected medical students, 25 said that they planned to work in a rural community. Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.

Out of 100 people sampled, 44 have lied to a family member in the past month. Based on this, construct a 95% confidence interval for the true population proportion of people who have lied to a family member in the past month.

Emily is a fifth-grade student who completed a standardized reading test. She scored one standard deviation above the mean score. Answer the following questions: How does the normal curve help you understand what this means about how Emily compared to other children who took the test? Explain how you determined your findings. How many children scored lower than Emily? How many children scored higher?

Out of 300 people sampled, 279 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids.

In a survey of 2646 ​adults, 1401 say they have started paying bills online in the last year. Construct a​ 99% confidence interval for the population proportion. Interpret the results.

Out of 157 randomly selected adults in the United States who were surveyed, 77 exercise on a regular basis. Construct a 95% confidence interval for the proportion of all adults in the United States who exercise on a regular basis. Round to three decimal places.

Suppose a marketing company computed a 96% confidence interval for the true proportion of customers who click on ads on their smartphones to be (0.59 , 0.71)

As health insurance costs and the number of disabled employees increase, more companies are firing these employees.  A survey of 750 employers found that 192 dismiss employees as soon as they go on long-term disability. Construct a 90% confidence interval for the proportion of employers who dismiss employees as soon as they go on long-term disability.

A marketing study by Ford Motor Company finds that 320 of the 650 buyers of compact cars were women. Construct the 90% confidence interval for the proportion of all compact car buyers who are women, and explain what it means.