Suppose a statistician draws a random sample of 1,000 people from a population with an unknown average salary. The average salary of the 1,000 people in the sample is $48,000 and the standard deviation of the salaries of these 1,000 people is $23,000. The statistician estimates the average salary of the entire population to be $48,000. For an approximate 90% confidence interval, the statistician includes a margin of error of about how many dollars? Select the closest answer. $23,000 $12 $1,200 $120 $12,000 $230 $4,800 $23