The u.s census bureau reports the estimated mean u.s married couple family income is $90,835 plus or minus $101. they describe the margin of error as providing a 90% probability that the interval defined by the estimate minus the margin of error and the estimate plus the margin of err the lower and upper confidence bounds contains the true value. What is the population and variable? What parameter is being estimated? How is the margin of error related to the maximum error of estimate