Final answer:
The correlation coefficient of -0.83 between income level and probability of psychosis indicates a strong negative relationship between these variables.
Step-by-step explanation:
The correlation coefficient of -0.83 between income level and probability of psychosis indicates a strong negative relationship between these variables. This means that as income level increases, the probability of psychosis decreases, and vice versa. Therefore, option c) There is a strong negative relationship between income level and probability of psychosis is the correct answer choice.