12. A health professional is concerned that people aren't brushing their teeth correctly in Knox County. During a recent event she talked to 118 people, and found that only 63 were brushing correctly....

Extracted text: 12. A health professional is concerned that people aren't brushing their teeth correctly in Knox County. During a recent event she talked to 118 people, and found that only 63 were brushing correctly. Answer the following: (a) Given this information, what type of confidence interval would be best to calculate u and why? (b) Find the margin of error for a 97% confidence interval. (c) Find the 95% confidence interval. (d) If she wanted to stay within a 4% margin of error, how many people would she need to survey?