# QNT 275 Week 4 Quiz

QNT 275 Week 4 Quiz

qQuestion1

For a given set of explanatory variables,
in general:

o

​a confidence
interval is narrower than a prediction interval.

o

​a confidence interval is wider than a prediction
interval.

o

​The width of a confidence interval cannot be determined.

o

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

·
question2

​The standard error of the estimate measures:

o

​the variability 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.

o

​the variability of the values of the sample regression
coefficients.

o

​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?

o

​+1

o

​-1

o

​Infinity

o

​0

·
question4

Which of the following variables is not
qualitative?​

o

​Gender of a person

o

​Religious affiliation

o

​Student's status (freshman, sophomore, etc.)

o

​Number of
dependents claimed on a tax return

·
question5

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

o

​β0

o

​x

o

​y

o

​ε

·

·

·

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question6

​Another name for an explanatory variable is the
___.

o

​descriptive variable

o

​independent
variable

o

​inferred variable

o

​dependent variable

·

·

·

·

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question7

​Serial correlation is typically observed in:

o

​outliers.

o

​sparse data.

o

​cross-sectional
data.

o

​time series data.

·
question8

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

o

​the unknown
parameters.

o

​the random error terms.

o

​the response variables.

o

​the explanatory variables.

·
question9

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

o

​Coefficient of Determination

o

​Standard Error of the Estimate

o

​Response

o

​Explanatory

·
question10

​Which of the following violates the assumptions of
regression analysis?

o

​The error term has a constant variance.

o

​The error term has a zero mean.

o

​The error term is normally distributed.

o

​The error term is
correlated with an explanatory variable.