# QNT 275 Week 4 Quiz

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QNT 275 Week 4 Quiz

Complete the quiz for Week 4

question1

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.

question2

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.

question3

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?

+1

-1

Infinity

0

question4

Which of the following variables is not qualitative?

Gender of a person

Religious affiliation

Student’s status (freshman, sophomore, etc.)

Number of dependents claimed on a tax return

question5

Consider the following simple linear regression model:   The response variable is:

β0

x

y

ε

question6

Another name for an explanatory variable is the ___.

descriptive variable

independent variable

inferred variable

dependent variable

question7

Serial correlation is typically observed in:

outliers.

sparse data.

cross-sectional data.

time series data.

question8

Consider the following simple linear regression model:   β0 and β1 are:

the unknown parameters.

the random error terms.

the response variables.

the explanatory variables.

question9

What is the name of the variable that’s used to predict another variable?

Coefficient of Determination

Standard Error of the Estimate

Response

Explanatory

question10

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.