Fans A survey of 81 randomly selected people standing in line to enter a football game found that 73 of them were home team fans. a) Explain why we cannot use this information to construct a confidence interval for the proportion of all people at the game who are fans of the home team. *b) Construct a plus-four confidence interval and interpret it in this context.

Confidence Interval Sample statistic Usually a point estimate Used to estimate population parameter Sample point estimate +/- margin of error Lower endpoint sample point estimate upper endpoint Margin of error Margin of error Measure of variability associated with point of estimate at desired level of confidence Small margin of error means higher precision Higher desired confidence level means a larger margin of error Lowest value in the computed confidence level =lower endpoint Highest value in the computed confidence level= higher endpoint Confidence interval for p Point estimate +/- margin of error Margin of