2. In looking at the percent of people in NYC that have blonde hair, researchers took a sample of 600 people and found that 400 had blonde hair. a. Use point estimation to estimate the proportion of people in NYC that have blonde hair. b. Use interval estimation at the 99% confidence level to estimate the proportion of people in NYC that have blonde hair. c. Interpret the above interval using the general and margin of error approaches to interval interpretation. d. Do the majority of NYC have blonde hair? Why or why not? If you can't tell, explain why. e. What is the margin of error here? If we wanted a margin of error of 7% at the 95% confidence level, what-sample size would we have needed? f. How does the formula change for sample size calculation when using the 90% C.I. instead of the 95%C.I.?

Fig: 1

Fig: 2

Fig: 3

Fig: 4

Fig: 5

Fig: 6

Fig: 7