3- Car and Driver Magazine tested a random sample of 9 hybrid cars and found their MPG to be 42, 51, 39, 44, 52, 48, 51, 44, and 47. Construct a 95% confidence interval for the population variance.

Out of a survey of 900 adults, 567 said that teenagers were more dangerous drivers than senior citizens. Construct a 99% confidence interval for p.

A scientist conducts an experiement with flowers, one sample of flowers consisted of 278 red dahilas and 108 white dahlias.  Find a 90% confidence interval estimate of the proportion of white flowers.

Of 130 adults selected randomly from one town, 30 of them smoke. Construct a 90% confidence interval for the true percentage of all adults in the town that smoke.

In a survey of 2291 ​adults, 708 say they believe in UFOs.   Construct a 90% confidence interval for the population proportion of adults who believe in UFOs

A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages.  Construct a 95% confidence interval for the proportion of adults who have a Facebook page.

In a survey of 32 students at a local high school, 17 support changing the schools mascot. Find the 90% confidence interval for the true population proportion of students who support changing the schools mascot.

A marketing study with a random sample of 400 results in 160 subjects reacting positively to the proposed product. Determine the 95% confidence interval for the population proportion.

In a random sample of 230 men, 18 or older, 142 are married. Construct and explain a 98% confidence interval estimate of the true population proportion of married men 18 or older.

Baylor University is interested in what proportion of applicants would like to enter statistics department. Of a random sample of 100 applicants, 24 chose the department. Construct a 99% confidence interval for the true proportion of all applicants that prefer statistics.