Using the data from Exercise 2.15,

Exercise 2.15

Kaufman and Rock (1962)
tested an earlier hypothesis about reasons for the moon illusion by comparing how observers performed when they were able to look at the moon with their eyes level, and again with their eyes elevated. The data for the Eyes Level condition follow:

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(a) Calculate (EX) and X. (b) Calculate X/N, where N = the number of scores. (c) What do you call what you just calculated?