QNT 275 Week 4 Quiz
Complete the quiz for Week 4
For a given set of explanatory variables, in general:
a confidence interval is narrower than a prediction interval.
a confidence interval is wider than a prediction interval.
The width of a confidence interval cannot be determined.
the width of a confidence interval is the same as the width of a prediction interval.
The standard error of the estimate measures:
the variability of the observed y-values around the predicted y-values.
the variability of the predicted y-values around the mean of the observed y-values.
the variability of the values of the sample regression coefficients.
the variability of the explanatory variables.
In a simple linear regression model, if the plots on a scatter diagram lie on a straight line, what is the standard error of the estimate?
Which of the following variables is not qualitative?
Gender of a person
Student’s status (freshman, sophomore, etc.)
Number of dependents claimed on a tax return
Consider the following simple linear regression model: The response variable is:
Another name for an explanatory variable is the ___.
Serial correlation is typically observed in:
time series data.
Consider the following simple linear regression model: β0 and β1 are:
the unknown parameters.
the random error terms.
the response variables.
the explanatory variables.
What is the name of the variable that’s used to predict another variable?
Coefficient of Determination
Standard Error of the Estimate
Which of the following violates the assumptions of regression analysis?
The error term has a constant variance.
The error term has a zero mean.
The error term is normally distributed.
The error term is correlated with an explanatory variable.