Week 5 Practice Worksheet

 

Chapter 13

 

1.   Your research team has been tasked with finding the correlation of the following scenario:

 

Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test (high scores mean more anxiety). The scores are as follows:

 

Person                          Dexterity                       Anxiety

 

1                                  1                                  10

2                                  1                                    8

3                                  2                                    4

4                                  4                                  -2

 

Describe the process that your research team would go through by completing the following:

 

1. Make a scatter diagram of the scores. Should be negative direction
2. Describe in words the general pattern of correlation, if any.
3. Figure the correlation coefficient.
4. Explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation (but who does understand the mean, standard deviation, Z scores, and hypothesis testing).
5. Give three logically possible directions of causality, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved (and why).