Conditional Probability - Contingency Tables Contingency tables can help us to visualize the interaction between two variables. The below contingency table shows the interaction between level of education and income level for a population of adults ages 3035. Education Level High School Vocational University+ CerticatelTrade School High 2 4 9 15 Income Med 4 11 8 23 Level Low 11 1 1 13 1? 16 18 Population size = 51 To calculate the probability that someone goes to university and remains at a low income, we simply divide the number of observations at the intersection and divide it by the population size. In this case, the answer is 151 or about 0.02. Contingency tables are particularly helpful to help us visualize and calculate conditional probabilities, by considering only a subset of the whole table. Directions: Use the contingency table to calculate the probability ofa student having a high income, given their highest level of education was high school. Your answer should be provided as a decimal rounded to two decimal places. For example, if the answer is 55% you would write 0.55. Review Later