Which of the following is the strongest correlation? a. .78 b. .00 1.67 d. -90 No way to tell without the mean of the two distributions. . e. What is the direction of the following correlations (+, -, no relationship): a. IQ and shoe size reading skills and the amount of television watched by primary school students b. . income and education A negative correlation coefficient means that a. there is no relationship between X and Y. b. as X increases, Y increases. c. the two variables change in opposite directions. d. there is a perfect relationship between X and Y.