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Do the variables seem normally distributed?

INSTRUCTIONS TO CANDIDATES
ANSWER ALL QUESTIONS

Module 6: Assignment

Instructions

First go through the Class Exercise.docx document and accompanying R script file and carefully follow each step in the document and write down your answers. When you have finished, transfer your answers below. 

 

Question at position 1

1

 

1 point 

Question 1 is unpinned. Click to pin. 

 

Question at position 1 

Do the variables seem normally distributed?

Do the variables seem normally distributed?

 

Yes

 

No

Question at position 2

2

 

1 point 

Question 2 is unpinned. Click to pin. 

 

Question at position 2 

Which of the below issues do you see with the data (if any)?

Which of the below issues do you see with the data (if any)?

 

Heteroscedasticity

 

Multicollinearity

 

Non-linearity

 

Non-independence of observations

Question at position 3

3

 

1 point 

Question 3 is unpinned. Click to pin. 

 

Question at position 3 

For any identified in the two responses above, how would you correct them? (try some different transformations and see what seems to work best).

For any identified in the two responses above, how would you correct them? (try some different transformations and see what seems to work best).

 

Squaring or cubing salary

 

Squaring or cubing years

 

-1/salary

 

-1/years

 

sqrt(salary)

 

sqrt(years)

 

log(salary)

 

log(years)

Question at position 4

4

 

1 point 

Question 4 is unpinned. Click to pin. 

 

Question at position 4 

In Model 1, is the IV significant?

In Model 1, is the IV significant?

 

Yes

 

No

Question at position 5

5

 

1 point 

Question 5 is unpinned. Click to pin. 

 

Question at position 5 

In reporting the results of Model 1, how much of the variance of salary would we say was accounted for by the model (report as a percentage rounded to 1 decimal place)?  Question Blank 1 of 1 %

Question at position 6

6

 

1 point 

Question 6 is unpinned. Click to pin. 

 

Question at position 6 

What do you notice after looking at the scatterplot plus the regression line and confidence intervals? Does it look like the model performs equally well across all values of the IV?

Display keyboard shortcuts for Rich Content Editor

What do you notice after looking at the scatterplot plus the regression line and confidence intervals? Does it look like the model performs equally well across all values of the IV?

12pt

Paragraph

 

 

Question at position 7

7

 

1 point 

Question 7 is unpinned. Click to pin. 

 

Question at position 7 

Do you notice anything amiss looking at the plot of the residuals vs the predicted values? 

Display keyboard shortcuts for Rich Content Editor

Do you notice anything amiss looking at the plot of the residuals vs the predicted values? 

12pt

Paragraph

 

 

Question at position 8

8

 

1 point 

Question 8 is unpinned. Click to pin. 

 

Question at position 8 

What does your model predict regarding the average salary of all employees with 15 years of experience at the 95% confidence level? 

What does your model predict regarding the average salary of all employees with 15 years of experience at the 95% confidence level? 

 

95% confident it’s between $129,207.40 and $140,495.10

 

It's exactly $134851.30

 

95% confident it’s between $80,273.37 and $189,429.20

Question at position 9

9

 

1 point 

Question 9 is unpinned. Click to pin. 

 

Question at position 9 

What does your model predict regarding the salary of a single employee with 6 years of experience at the 95% confidence level? 

What does your model predict regarding the salary of a single employee with 6 years of experience at the 95% confidence level? 

 

95% confident it’s between $49,461.75  and $164,781.75

 

It's exactly $57,121.75

 

95% confident it’s between $2,298.69  and $111,944.80

 

(5/5)
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