UCSB PSTAT 5LS UPDATED ACTUAL Exam Questions and CORRECT Answers

UCSB PSTAT 5LS UPDATED ACTUAL
Exam Questions and CORRECT Answers
Median - CORRECT ANSWER - -resistant to skew and outliers



Mean, S.D. and r - CORRECT ANSWER - aren't resistant to outliers



IQR - CORRECT ANSWER - Q3-Q1



Variance and S.D. - CORRECT ANSWER - Variance: s^2
S.D.: s


Correlation Coeffiecient - CORRECT ANSWER -r
test of direction and strength of relationship
**uses mean and S.D.


r - CORRECT ANSWER - r is unitless
r ranges from -1 to 1


Coefficient of determinant, r^2 (r squared) - CORRECT ANSWER - fraction of variation
in y about its mean, explained by regression model


Residuals - CORRECT ANSWER - - distance between line and plot
**predicted y (minus) observed y


Simpson's Paradox - CORRECT ANSWER - - when separate opposite outcome than when
all info is combinbed together