15. A survey showed that 720 of the 1000 adult respondents believe in global warming.

(a) Construct a 90% confidence interval estimate of the proportion of adults believing inglobalwarming. (Round the lower bound and upper bound of the confidence interval tothree decimalplaces) Include description of how confidence interval was constructed.

(b) Describe the results of the survey in everyday language.

16. A city built a new parking garage in a business district. For a random sample of 64 days, daily fees collected averaged $2,000, with a standard deviation of $400.

(a) Construct a 90% confidence interval estimate of the mean daily parking feescollected. (Round the lower bound and upper bound of the confidence interval to twodecimal places) Include description of how confidence interval was constructed.

(b) Describe the confidence interval in everyday language.