A group of managers, whose members work closely together, needs to estimate the size of the market for a new product. An average of their individual estimates is to be used in the decision making process. Which of the following statements is not true according to research? Question 1: More than five managers should be included in the group to obtain an average (a) that is a reliable estimate of the size of the market (b) It is likely that little will be gained by taking a weighted average of the individual managers' estimates (C) Doubling the size of the group is unlikely to double the accuracy of the average as an estimate of the market size (d) If the estimates of the individual managers are independent, the accuracy of the average as an estimate of the market size is likely to improve the larger the size of the group