MGSC 291 Exam 3 Study Guide |\ |\ |\ |\ |\ |\
QUESTIONS WITH ANSWERS |\ |\
increasing the sample size will usually yield a ___________
|\ |\ |\ |\ |\ |\ |\ |\ |\
confidence interval - CORRECT ANSWERS ✔✔narrower |\ |\ |\ |\ |\
increasing the confidence level will yield a _____________
|\ |\ |\ |\ |\ |\ |\ |\
confidence interval - CORRECT ANSWERS ✔✔wider |\ |\ |\ |\ |\
a small p-value indicates evidence for the _____________
|\ |\ |\ |\ |\ |\ |\ |\
hypothesis - CORRECT ANSWERS ✔✔alternative |\ |\ |\ |\
the p-value for the f-test in the anova box is 0.01. this means: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔at least one predictor is important to the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
model
the r-square for the regression is 0.346 and the adjusted r-square
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
is 0.271. this means that: - CORRECT ANSWERS ✔✔there is a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
weak predictor in the model
|\ |\ |\ |\
the p-value for size*fireplace is 0.462, meaning that: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔the interaction is not significant
|\ |\ |\ |\ |\
you find that one of the interactions is not significant. what is the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
next step for the regression? - CORRECT ANSWERS ✔✔remove
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the interaction and re-run the regression
|\ |\ |\ |\ |\
, the residual standard error is 62.39091 - interpret the standard
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
error for the regression - CORRECT ANSWERS ✔✔predictions of
|\ |\ |\ |\ |\ |\ |\ |\ |\
assessed value tend to be off by $62,390.91, in general
|\ |\ |\ |\ |\ |\ |\ |\ |\
the estimated coefficient for "period" is -.71687. interpret the
|\ |\ |\ |\ |\ |\ |\ |\ |\
coefficient: - CORRECT ANSWERS ✔✔as period increases by 1, we |\ |\ |\ |\ |\ |\ |\ |\ |\
expect the percent of summoned jurors to decrease by .72, after
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
accounting for year.
|\ |\ |\
the p-value for period is 0.000005, meaning that the period is: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔highly significant |\ |\ |\
when using a regression model for prediction, one should be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
concerned with: - CORRECT ANSWERS ✔✔minimizing standard |\ |\ |\ |\ |\ |\ |\
error of the regression |\ |\ |\
you run a multiple regression that has a low p-value for the f-test,
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
and large p-values for each of the predictors. you should
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
suggest: - CORRECT ANSWERS ✔✔collinearity |\ |\ |\ |\
collinearity is important to diagnose if you are: - CORRECT |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔interpreting the regression coefficients |\ |\ |\ |\
you run a multiple regression with 2 predictors. one has a high p-
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
value and the other has a low p-value. you should conclude that:
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔the term with the high p-value might
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
be better for predicting the response
|\ |\ |\ |\ |\
QUESTIONS WITH ANSWERS |\ |\
increasing the sample size will usually yield a ___________
|\ |\ |\ |\ |\ |\ |\ |\ |\
confidence interval - CORRECT ANSWERS ✔✔narrower |\ |\ |\ |\ |\
increasing the confidence level will yield a _____________
|\ |\ |\ |\ |\ |\ |\ |\
confidence interval - CORRECT ANSWERS ✔✔wider |\ |\ |\ |\ |\
a small p-value indicates evidence for the _____________
|\ |\ |\ |\ |\ |\ |\ |\
hypothesis - CORRECT ANSWERS ✔✔alternative |\ |\ |\ |\
the p-value for the f-test in the anova box is 0.01. this means: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔at least one predictor is important to the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
model
the r-square for the regression is 0.346 and the adjusted r-square
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
is 0.271. this means that: - CORRECT ANSWERS ✔✔there is a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
weak predictor in the model
|\ |\ |\ |\
the p-value for size*fireplace is 0.462, meaning that: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔the interaction is not significant
|\ |\ |\ |\ |\
you find that one of the interactions is not significant. what is the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
next step for the regression? - CORRECT ANSWERS ✔✔remove
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the interaction and re-run the regression
|\ |\ |\ |\ |\
, the residual standard error is 62.39091 - interpret the standard
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
error for the regression - CORRECT ANSWERS ✔✔predictions of
|\ |\ |\ |\ |\ |\ |\ |\ |\
assessed value tend to be off by $62,390.91, in general
|\ |\ |\ |\ |\ |\ |\ |\ |\
the estimated coefficient for "period" is -.71687. interpret the
|\ |\ |\ |\ |\ |\ |\ |\ |\
coefficient: - CORRECT ANSWERS ✔✔as period increases by 1, we |\ |\ |\ |\ |\ |\ |\ |\ |\
expect the percent of summoned jurors to decrease by .72, after
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
accounting for year.
|\ |\ |\
the p-value for period is 0.000005, meaning that the period is: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔highly significant |\ |\ |\
when using a regression model for prediction, one should be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
concerned with: - CORRECT ANSWERS ✔✔minimizing standard |\ |\ |\ |\ |\ |\ |\
error of the regression |\ |\ |\
you run a multiple regression that has a low p-value for the f-test,
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
and large p-values for each of the predictors. you should
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
suggest: - CORRECT ANSWERS ✔✔collinearity |\ |\ |\ |\
collinearity is important to diagnose if you are: - CORRECT |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔interpreting the regression coefficients |\ |\ |\ |\
you run a multiple regression with 2 predictors. one has a high p-
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
value and the other has a low p-value. you should conclude that:
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔the term with the high p-value might
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
be better for predicting the response
|\ |\ |\ |\ |\
