Dr. Orion finds a negative correlation between hours of sleep and proportion of pessimistic responses. The direction of the correlation indicates that a. as hours of sleep increase, the proportion of pessimistic responses decrease. b. there is no relationship between the change in hours of sleep and the proportion of pessimistic responses. c. as hours of sleep decrease, the proportion of pessimistic responses decrease. d. as hours of sleep increase, the proportion of pessimistic responses increase