Correlating the Scores of 50 Students on Two Tests, an Investigator

Multiple Choice

Correlating the scores of 50 students on two tests, an investigator found that the sum of the z-score cross-products was 20.The Pearson's product moment coefficient in this case is:

A) impossible to compute with the information given.
B) .02.
C) .20.
D) .40.
E) None of these are true.