Week 5 Practice Worksheet

Provide a response to the following questions.

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 your research team would go through by completing the following:

Create a scatter diagram of the scores, which should be a negative direction.

 

Describe in words the general pattern of correlation, if any.
 

Figure the correlation coefficient.

 

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).

 

Provide 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. Explain why.