10-31-08 - Psychology 206 Class Notes DO THE PRACTICE TEST...

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Psychology 206 – Class Notes – 10/31/08 DO THE PRACTICE TEST – We will be going over it on Monday LOOK OVER THE LAST QUIZ!!!!!!!!!!!!!!!!!!!!!!!!!!! Do exercise # 21 for Monday A WORD ON EXERCISE #19 Problems associated with extrapolation (item 10) o Extrapolation – Trying to predict Y for values of X beyond those contained in the actual data is called extrapolation o It is problematic to extrapolate beyond the data - extrapolating beyond the range of the data is not good – you might not be accounting for a change in the function or regression Residuals (item #11) o You don’t have to a make a table to calculate residuals A WORD ON EXERCISE #19 Issues of rounding (especially on the exam) Always go out to 4 decimal places EXERCISE #20 How much is predictable versus unpredictable the proportion of variance in Y account for by variance in X. Part 1 from Exercise #20 WILL BE ON THE EXAM When you write the final equation, use VARIABLE NAMES, not X and Y
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10-31-08 - Psychology 206 Class Notes DO THE PRACTICE TEST...

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