Each month the government releases unemployment statistics. The stated unemployment rate doesn’t include people who choose not to be employed, such as retirees. Based on a random sample of 1000 California adults, a 99% confidence interval for the proportion of all California adults employed in the workforce is 0.532 to 0.612.

a. Interpret the confidence level.

b. Name two things you could do to reduce the margin of error. What drawbacks do these actions have?

c. Describe how untruthful answers might lead to bias in this survey. Does the stated margin of error account for this possible bias?