After a set of surveys was compiled and analyzed, the mean value was reported as 10.5 + 0.8. Select the true statement for this data. a.) The margin of error is equal to 10.5 and the estimate is equal to + 0.8. b.) The estimate is equal to 10.5 and the confidence interval is equal to + 0.8. c.) The margin of error is equal to + 0.8 and the confidence interval is equal to O 10.5. d.) The estimate is equal to 10.5 and the margin of error is equal to + 0.8