ISYE6414 MIDTERM FINAL SCRIPT STUDY
GUIDE COMPLETE QUESTIONS AND
ANSWERS UPDATED ACCURATE
GUARANTEED PASS
●● error terms.
Answer: The ______________ for multiple linear regression have
constant variance.
●● normality.
Answer: QQPlot and histogram are used to assess what in MLR?
●● linearity.
Answer: Residuals vs predictor are used to predict what in MLR
●● constant variance and independence.
Answer: Residuals vs fitted values are used to assess what in MLR
●● leverage points.
Answer: Points that are far from the mean of the x's are called
●● Influential points.
,Answer: Points that are far from the mean of the x's and y's are called
●● outliers.
Answer: It is good practice to perform regression analysis with and
without what?
●● Cook's distance.
Answer: What is used to quantify outliers?
●● Cook's distance.
Answer: How much all the values in the model change when the ith
value is removed is known as what?
●● D_i > 4/n or D_i > 1 or Large D.
Answer: Cooks distance that should be investigated.
●● R-Squared.
Answer: The proportion of variability in Y than can be explained by the
predictor variables.
●● Controlling factors.
Answer: Model variables used to account for selection bias.
, ●● Indicator variable.
Answer: Continuous variables are converted to ________ when there is
a distinct gap in a variable distribution.
●● n-p-1.
Answer: The number of degrees of freedom for a T test for the statistical
significance of a MLR coefficient?
●● At least one variable has explainitory power on the response
variable..
Answer: When the regression model has a high F value/low p-value.
●● order matters.
Answer: When testing subsets of coefficients using anova command.
●● If the variable is not very granular.
Answer: When can "year" be used as a qualitative variable?
●● Pearson Chi-squared test.
Answer: Used to evaluate the relationship between any two qualitative
variables.
●● table.
GUIDE COMPLETE QUESTIONS AND
ANSWERS UPDATED ACCURATE
GUARANTEED PASS
●● error terms.
Answer: The ______________ for multiple linear regression have
constant variance.
●● normality.
Answer: QQPlot and histogram are used to assess what in MLR?
●● linearity.
Answer: Residuals vs predictor are used to predict what in MLR
●● constant variance and independence.
Answer: Residuals vs fitted values are used to assess what in MLR
●● leverage points.
Answer: Points that are far from the mean of the x's are called
●● Influential points.
,Answer: Points that are far from the mean of the x's and y's are called
●● outliers.
Answer: It is good practice to perform regression analysis with and
without what?
●● Cook's distance.
Answer: What is used to quantify outliers?
●● Cook's distance.
Answer: How much all the values in the model change when the ith
value is removed is known as what?
●● D_i > 4/n or D_i > 1 or Large D.
Answer: Cooks distance that should be investigated.
●● R-Squared.
Answer: The proportion of variability in Y than can be explained by the
predictor variables.
●● Controlling factors.
Answer: Model variables used to account for selection bias.
, ●● Indicator variable.
Answer: Continuous variables are converted to ________ when there is
a distinct gap in a variable distribution.
●● n-p-1.
Answer: The number of degrees of freedom for a T test for the statistical
significance of a MLR coefficient?
●● At least one variable has explainitory power on the response
variable..
Answer: When the regression model has a high F value/low p-value.
●● order matters.
Answer: When testing subsets of coefficients using anova command.
●● If the variable is not very granular.
Answer: When can "year" be used as a qualitative variable?
●● Pearson Chi-squared test.
Answer: Used to evaluate the relationship between any two qualitative
variables.
●● table.
