FOREST BIOMETRICS COMPREHENSIVE TEST PAPER QUESTIONS AND SOLUTIONS VERIFIED ANSWERS

FOREST BIOMETRICS COMPREHENSIVE
TEST PAPER QUESTIONS AND SOLUTIONS
VERIFIED ANSWERS

●● Used when a numerical predictor has a curvilinear relationship with
the response
Answer: quadratic regression


●● Worst kind of outlier, can totally reverse the direction of association
between x and y.
Answer: influential points


●● Used to check the assumptions of the regression model
Answer: residual plots


●● Used when trying to decide between two models with different
numbers of predictors
Answer: R2 adjusted


●● Proportion of the variability in y explained by the regression model.
Answer: R2

, ●● Is the observed value of y minus the predicted value of y for the
observed x
Answer: residual


●● Can be erroneously assumed in an observational study
Answer: cause and effect


●● Problem that can occur when the information provided by several
predictors overlaps
Answer: multicollinearity


●● Can give bad predictions if the conditions do not hold outside the
observed range of x's
Answer: extrapolation


●● A point that lies far away from the rest.
Answer: outliers


●● The value of r is always between 0 and 1
Answer: false