Question: Using the data from Exercise 13, convert E-I ratings to a dichotomous variable by assigning 0 to ratings of 3 or lower and assigning 1 to ratings of 4 and above. You should now have two columns of dichotomous data, in which participation scores are coded 1 or 2 and E-I scores are coded 0 or 1. Compute the phi coefficient, and compare your results to those of the previous two exercises. What happens to the correlation as our coding of the data removes information?

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