# QNT 275 Week 4 Quiz

**https://uopcourses.com/category/qnt-275/**

**Week 4 Quiz**

**•**

**question1**

**For a given set**

of explanatory variables, in general:

of explanatory variables, in general:

**o**

**a confidence**

interval is narrower than a prediction interval.

interval is narrower than a prediction interval.

**o**

**a confidence**

interval is wider than a prediction interval.

interval is wider than a prediction interval.

**o**

**The width of a**

confidence interval cannot be determined.

confidence interval cannot be determined.

**o**

**the width of a**

confidence interval is the same as the width of a prediction interval.

confidence interval is the same as the width of a prediction interval.

**•**

**question2**

**The standard**

error of the estimate measures:

error of the estimate measures:

**o**

**the variability**

of the observed y-values around the predicted y-values.

of the observed y-values around the predicted y-values.

**o**

**the variability**

of the predicted y-values around the mean of the observed y-values.

of the predicted y-values around the mean of the observed y-values.

**o**

**the variability**

of the values of the sample regression coefficients.

of the values of the sample regression coefficients.

**o**

**the variability**

of the explanatory variables.

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?

linear regression model, if the plots on a scatter diagram lie on a straight

line, what is the standard error of the estimate?

**o**

**+1**

**o**

**-1**

**o**

**Infinity**

**o**

**0**

**•**

**question4**

**Which of the**

following variables is not qualitative?

following variables is not qualitative?

**o**

**Gender of a**

person

person

**o**

**Religious**

affiliation

affiliation

**o**

**Student's status**

(freshman, sophomore, etc.)

(freshman, sophomore, etc.)

**o**

**Number of**

dependents claimed on a tax return

dependents claimed on a tax return

**•**

**question5**

**Consider the**

following simple linear regression model:

The response variable is:

following simple linear regression model:

The response variable is:

**o**

**β**

**0**

**o**

**x**

**o**

**y**

**o**

**ε**

**•**

**•**

**•**

**•**

**question6**

**Another name for**

an explanatory variable is the ___.

an explanatory variable is the ___.

**o**

**descriptive**

variable

variable

**o**

**independent**

variable

variable

**o**

**inferred**

variable

variable

**o**

**dependent**

variable

variable

**•**

**•**

**•**

**•**

**•**

**question7**

**Serial**

correlation is typically observed in:

correlation is typically observed in:

**o**

**outliers.**

**o**

**sparse data.**

**o**

**cross-sectional**

data.

data.

**o**

**time series**

data.

data.

**•**

**question8**

**Consider the**

following simple linear regression model:

β0 and β1 are:

following simple linear regression model:

β0 and β1 are:

**o**

**the unknown**

parameters.

parameters.

**o**

**the random error**

terms.

terms.

**o**

**the response**

variables.

variables.

**o**

**the explanatory**

variables.

variables.

**•**

**question9**

**What is the name**

of the variable that's used to predict another variable?

of the variable that's used to predict another variable?

**o**

**Coefficient of**

Determination

Determination

**o**

**Standard Error**

of the Estimate

of the Estimate

**o**

**Response**

**o**

**Explanatory**

**•**

**question10**

**Which of the**

following violates the assumptions of regression analysis?

following violates the assumptions of regression analysis?

**o**

**The error term**

has a constant variance.

has a constant variance.

**o**

**The error term**

has a zero mean.

has a zero mean.

**o**

**The error term**

is normally distributed.

is normally distributed.

**o**

**The error term**

is correlated with an explanatory variable.

is correlated with an explanatory variable.

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