Suppose that, in a suburb of 12,345 people, 6,523 people moved there within the past five years. You survey 500 people and find that 245 of the people in your sample moved to the suburb in the past five years.
a. What is the population proportion of people who moved to the suburb in the past five years?
b. What is the sample proportion of people who moved to the suburb in the past five years?
c. Does your sample appear to be representative of the population of the suburb? Discuss.
Assume that your want to construct a 95% confidence interval estimate of a population mean. Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval. The sample standard deviation is given.