Indicate which type of forecasting method is being described. Relies upon opinion and expertise of people in developing forecasts Asks those who are close to the end consumer, such as salespeople, about the customer's purchasing plans Forecasts by expert opinion by gathering judgments and opinions of key personnel based on their experience and knowledge of the situation Forecasts by using an average of the most recent " k " observations in a time series Forecasting technique that uses a weighted average of past time-series values to forecast the value of the time series in the next period A method for building a statistical model that defines a relationship between a single dependent variable and one or more independent variables, all of which are numerical