Quiz Need answers in 1 hour

1Consider the following simple linear regression model:  The response variable is: 

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  β0

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  ε

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  y

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  x

   

  2. Which of the following violates the assumptions of regression analysis?

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  The error term has a zero mean.

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  The error term has a constant variance.

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  The error term is correlated with an explanatory variable.

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  The error term is normally distributed.

   

  3.For a given set of explanatory variables, in general:

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

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  a confidence interval is narrower than a prediction interval.

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  a confidence interval is wider than a prediction interval.

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  The width of a confidence interval cannot be determined.

   

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

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  the response variables.

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  the explanatory variables.

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  the unknown parameters.

   

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  the random error terms.

   

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

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  Standard Error of the Estimate

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  Response

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  Explanatory

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  Coefficient of Determination

  6.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?

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  +1

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  -1

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  0

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  Infinity

   

  7.The standard error of the estimate measures:

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  the variability of the explanatory variables.

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

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

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  the variability of the values of the sample regression coefficients.

  8.Serial correlation is typically observed in:

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  outliers.

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  time series data.

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  sparse data.

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  cross-sectional data.

  9.Which of the following variables is not qualitative?

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

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  Religious affiliation

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  Gender of a person

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  Number of dependents claimed on a tax return

   

  10.Another name for an explanatory variable is the ___. 

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  independent variable

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  descriptive variable

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  dependent variable

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  inferred variable