independent variable

1. Central Tendency, Spread, or Symmetry?
What is an explanatory variable?
The explanatory variable is the thing doing

2. Central Tendency, Spread, or Symmetry?
What is an explanatory variable?
The explanatory variable influences the variable of interest.

3. Central Tendency, Spread, or Symmetry?
Explanatory Variable Variable of Interest
Does Age influence Driving speed?
Do Bonuses influence Employee productivity?
Do Promotions influence Employee retention?
What is an explanatory variable?
The explanatory variable influences the variable of interest.

4. Example of a question with
ONE explanatory variable

5. Example of a question with
ONE explanatory variable
Does the new employee self-initiative plan effect
employee productivity?
1

6. Example of a question with
TWO variables of interest

7. Example of a question with
TWO variables of interest
Does the new employee self-initiative plan and
getting a bonus or not effect employee
productivity?
1
2

8. Let’s Practice!

9. How many explanatory variables are there in
each question that follows?

10. One Two or More
Does the morning, afternoon, or evening shifts
have the highest employee satisfaction rates?

11. One Two or More
Does the morning, afternoon, or evening shifts
have the highest employee satisfaction rates?

12. One Two or More
Does the morning, afternoon, or evening shifts
have the highest employee satisfaction rates?

13. One Two or More
Does the morning, afternoon, or evening shifts
have the highest employee satisfaction rates?
Explanatory Variable Variable of Interest
Assigned shift influence Employee satisfaction rates

14. Next Example

15. One Two or More
Is there a significant difference between the type of
training received and whether one is college
educated or not in terms of agent commission?

16. One Two or More
Is there a significant difference between the type of
training received and whether one is college
educated or not in terms of agent commission?

17. One Two or More
Is there a significant difference between the type of
training received and whether one is college
educated or not in terms of agent commission?

18. One Two or More
Is there a significant difference between the type of
training received and whether one is college
educated or not in terms of agent commission?
Explanatory Variable Variable of Interest
Type of training Agent commission
College educated or not

19. Final Example

20. One Two or More
Which training method (A, B, or C) brings about
greater trainee proficiency?

21. One Two or More
Which training method (A, B, or C) brings about
greater trainee proficiency?

22. One Two or More
Which training method (A, B, or C) brings about
greater trainee proficiency?

23. One Two or More
Which training method (A, B, or C) brings about
greater trainee proficiency?
Explanatory Variable Variable of Interest
Training Method Training proficiency