21. what method of demand forecasting that invites different experts and takes their opinion and they finally try to find an average of their ideas?

a.time series method

b. qualitative method

c. delphi technique

d. nominal group technique

22. What type of demand forecasting entails the collection of information about the issues from various groups of people using and may take an interview, collect data using questionnaire, organize meeting/conference to find the opinion of people?

a. survey method

b. delphi technique

c. consumer survey method

d. opinion pool method

23. what type of forecasting that uses past data or performance that are arranged in orderly manner?

a. quantitative method

b. time series

c. delphi technique

d. survey method

24. _____ is applied to determine the strength of the association between variables and for modeling the forthcoming relationship between them.

a. regression analysis

b. time series

c. simple percentage

25. In the equation Yt - a+bx, which is the independent variable?

26. what is the primary basic assumptions of linear programming?

27. What does least square method determine?

a.optimum combination

b. line of best fit

c. producers equilibrium

d. all of the foregoing

29. In the linear Yt =a+bx, what are the unkowns?

30. In negative relationship between the dependent and independent variable , where does the dependent variable will move if there is an increase in the independent variable?