Derick works as a researcher and market analyst for a company. his current responsibility is to forecast the company's sales. he plans to conduct a survey or interviews, in which he will ask potential consumers about their savings and investment plans, purchasing power, frequency of purchases, plans to buy a particular product, and so on. derick plans to arrive at the company's sales forecast based on the information that he gains through this survey. which method of sales forecasting does derick intend to use?

Stocks a, b, and c are similar in some respects: each has an expected return of 10% and a standard deviation of 25%. stocks a and b have returns that are independent of one another; i. e., their correlation coefficient, r, equals zero. stocks a and c have returns that are negatively correlated with one another; i. e., r is less than 0. portfolio ab is a portfolio with half of its money invested in stock a and half in stock b. portfolio ac is a portfolio with half of its money invested in stock a and half invested in stock c. which of the following statements is correct? a. portfolio ab has a standard deviation that is greater than 25%.b. portfolio ac has an expected return that is less than 10%.c. portfolio ac has a standard deviation that is less than 25%.d. portfolio ab has a standard deviation that is equal to 25%.e. portfolio ac has an expected return that is greater than 25%.