Interpret each of these statements.
a. The correlation between vocational-interest scores at age 20 and at age 40 for the 150 participants was .70
b. The correlation between intelligence test scores of identical twins raised together is .86
c. A correlation of -30 between IQ and family size
d. r = -22 between height and IQ for 20-year-old men
e. r = - 83 between income level and probability of diagnosis of schizophrenia.