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Four research participants take a test of mannual dexterity (high scores mean better dexterity) and anxiety test (high scores mean more anxiety). 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 weather the correlation is statistically significant (use the .05 significance level, two-tailed)
e) Explain the lodgic of what you have done, writing as if you are speaking to someone who has never heard of correlation.
f) Give 3 logically possible directions of causality.
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The president of an agency specializing in public opinion surveys claims that approximately 70% of all people to whom the agency sends questionnaires responds by filling out an returning the questionnaire.
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