Ian tends to be very shy about participating in class discussions. You decide to try to promote greater participation in class discussion by first smiling encouragingly at him when he merely looks interested in saying something, then smiling at him when he raises his hand, and then praising him when he actually makes a contribution. The technique you are using is referred to as:.
a. spontaneous recovery. b. shaping.
c. extinction.
d. positive reinforcement.

Griffin correctly concludes that the coordinate pair for the russian federation is an influential point, because removing the russian federation from the relationship will significantly change the trend of the regression line. is an influential point, because removing the russian federation from the relationship will not significantly affect the estimated coefficient of determination of the regression line. is not an influential point, because the russian federation does not have the highest cvdir of all 1111 nations in the scatterplot. is an influential point, because removing the russian federation from the relationship will not significantly affect the estimated slope of the regression line. is not an influential point, because the russian federation has a positive residual in the least-squares linear regression.