Quantitive Method

REVISED M04_REND6289_10_IM_C04.QXD 5/7/08 2:49 PM pageboy 46 C H A P T E R Regression Models 4 15 9 40 20 25 25 15 35 6 4 16 6 13 9 10 16 TEACHING SUGGESTIONS teaching proposal 4.1: Which Is the Independent Variable? We ?nd that students argon oftentimes mixed-up about which inconstant is self-sufficing and which is dependent in a atavism model. For example, in Triple As problem, enlighten which variable is X and which is Y. Emphasize that the dependent variable (Y ) is what we are trying to predict based on the care for of the independent (X) variable. Use examples such as the time essential to impel to a store and the distance traveled, the totals number of units change and the change price of a product, and the cost of a estimator and the processor speed. Teaching Suggestion 4.2: Statistical Correlation Does not endlessly Mean Causality. Students should understand that a high R2 doesnt always mean genius variable will be a good predictor of the ot her. Explain that skirt lengths and wrinkle market prices may be correlated, but raising one doesnt inevitably mean the other will go up or down.

An interesting study indicated that, over a 10-year period, the salaries of college professors were passing correlated to the dollar sales volume of pelter beverages (both were very correlated with in?ation). Teaching Suggestion 4.3: put up students a set of selective information and have them piece the data and manually draw a line by the data. A discussion of which line is best sack up help them cherish the least squares criterion. Teaching Suggestion 4.4: choose some promiscuously generated values for X and Y (you eject use ergo dic numbers from the random number circuit ! card in Chapter 15 or use the RAND function in outdo). Develop a regression line using Excel and discuss the coef?cient of finale and the F-test. Students will see that a regression line can always be developed, but it may not necessarily be useful. Teaching Suggestion 4.5: A discussion of the longsighted formulas and short-cut formulas...If you want to get a right essay, order it on our website: OrderEssay.net

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