PSY 555 Homework 17

Chapter 15: #6,8,16,21

1. Please
explain how there may be no outliers for each individual variable, but there
may be outliers in the regression model.

2. Explain partial and semi-partial correlation.

3. Interpret
the variance accounted for, significance in the regression model, and the
variance account for by the first variable when the second variable entered
into the equation has:

a. a semipartial
correlation of .73 and a partial correlation of .75

b. a semipartial
correlation of .07 and a partial correlation of .45.

4. Name and describe the three classes of
diagnostic statistics.

5. Using a Venn
diagram, illustrate the partial and semi-partial correlation given that:

a.
There are two variables, X1 and X2

b. The
squared correlation between Y and X1 equals .542

c. The squared correlation between Y and X2
equals .340.

d. The residual variation in Y equals .218.

Include
all values * in* your drawing.