A corporation is interested in estimating the total carnings from sales of colour television sets at the end of a three-month period. The total earnings figures are available for all districts within the corporation for the corresponding three-month period of the previous year. A simple random sample of 13 district offices is selected from the 123 offices within the corporation. a) b) c) Use a ratio estimator to estimate the total earnings at the end of the three-month period. - 128,200. Take x Use the data below and find == 1 - 582 2 different ways using both the formulac Sp» = πλη (Σy, – Rxg)* = 1, Σy? - 28 Σx,y, + Σx?] n-1 12-1 Estimate the standard error (standard deviation) of your estimate.