ISYE 6414 Study guides, Class notes & Summaries

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ISYE 6414 FINAL EXAM (REAL EXAM) QUESTIONS AND ANSWERS /

The prediction interval of one member of the population will always be larger than the confidence interval of the mean response for all members of the population when using the same predicting values. (T/F) - correct answer True. See 1.7 Regression Line: Estimation & Prediction Examples "Just to wrap up the comparison, the confidence intervals under estimation are narrower than the prediction intervals because the prediction intervals have additional va...

What is cooks distance used for? - correct answer It measures how much all of the values in the regression model change with the ith observation is removed. Basically its a test for outliers Rule of thumb: D denotes cooks distance, if D is > 4/n OR D > 1 or any large D then it may be an outlier and should be removed. If the normality assumption does not hold, we can pursue a transformation in the response variable. T/F - correct answer ...

response (dependent) variables - correct answer one particular variable that we are interested in understanding or modeling (y) predicting or explanatory (independent) variables - correct answer a set of other variables that might be useful in predicting or modeling the response variable (x1, x2) What kind of variable is a response variable and why? - correct answer random, because i...

response (dependent) variables - correct answer one particular variable that we are interested in understanding or modeling (y) predicting or explanatory (independent) variables - correct answer a set of other variables that might be useful in predicting or modeling the response variable (x1, x2) What kind of variable is a response variable and why? - correct answer random, because i...

We can assess the constant variance assumption in linear regression by plotting the residuals vs. fitted values. - correct answer True If one confidence interval in the pairwise comparison in ANOVA includes zero, we conclude that the two corresponding means are plausibly equal. - correct answer True The assumption of normality is not required in linear regression to make inference on the regression coefficients. - corr...

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