QNT 275 Week 4 participation Final Exam Review

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QNT 275 Week 4 participation Final Exam Review
QNT 275 Week 4 participation Final Exam Review
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QNT 275 Week 4 participation Final Exam Review

Week 4 Practice Problem #1

 

Team

 

Below is a problem that you may see on the Final Exam or the Quiz:

 

Which of the following violates the assumptions of regression analysis?

  • The error term does not have the normal distribution.

  • The error term has a constant variance.

  • The error term is uncorrelated with an explanatory variable.

  • The error term has a zero mean.

 

I chose the 1st option because there are 4 assumptions of Regression Analysis and the 1st option does not align to the 4 assumptions:

 

  1. There is a linear relationship between the Independent and the Dependent Variable

  2. There is a statistical indepedendence of errors

  3. Homoscedasticity of the errors which means there is a constant variance

  4. The Error doesfollow the Normal Distribution

 

What does the term Homoscedasticity mean?

 

 

Week 4 Practice Problem #2

 

Team

 

Below is a problem that you may see on the Final Exam or on the Quiz

 

In the sample regression equation  what is  ?

 

 

  • The value of ywhen x = 0

  • The y-intercept

  • The predicted value of y, given a specific x value

  • The slope of the equation

 

Why would I have chosen the 3rd option? What is the relationship between X (the Independent Variable) and Y (the Dependent Variable)?

 

 

 

Week 4 Practice Problem #3

 

Team

 

Below is a problem that you may see on the Final or on the Quiz

 

 

 

What type of relationship is indicated in the scatterplot?

 

  • A positive linear or curvilinear relationship

  • A negative linear relationship

  • No relationship

  • A negative curvilinear relationship

 

I picked the 1st option, because a positive relationship is illustrated on a Scatter Plot when the data points move from the bottom left to the upper right. What would a Negative Relationship look like if it was illustrated?

 

 

Week 4 Practice Problem #4

 

Team

 

Below is a problem that you may see on the Final or on the Quiz:

 

Serial correlation is typically observed in:

  • sparse data

  • cross-sectional data

  • time series data

  • outliers

 

Why would I have selected Time Series Data?