Look again at the data in the electronic communications in Exercise 54.
a) If we select a respondent at random, what’s the probability that we choose a person earning less than $50 K and responded “somewhat”?
b) Among those earning $50-99.9K, what is the probability that the person responded “not at all”?
c) What’s the probability that a person who responded “very much” was earning at least $100K?
d) If the person responded “very much,” what is the probability that they earn between $50K and 99.9K?
e) Are the responses to the question and income level independent?