Question: A psychologist has developed a new intelligence test based on brain wave activity. She wants to determine its reliability; that is, she wants to see the degree to which the test yields the same score each time it is administered to a person. To measure its reliability, she gives the test to 12 selected persons on two separate occasions, with an interest interval of 3 weeks. Scores on the test range from 1 to 25, and the data from the 12 individuals are shown here. Compute the correlation coefficient ant test it for significance.