Question: 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

(a) make a scatter diagram of the scores

(b) describe in words the general pattern of correlation, if any;

(c) figure the correlation coefficient

(d) figure whether the correlation is statistically significant (use the .05 significance level, two-tailed)

(e) explain the logic of what you have done, writing as if you were speaking to someone who has never heard of correlation (but does understand the mean, deviations cores and hypothesis testing)

(f) give three logically possible directions of causality, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variable involved (and why?)