A local survey indicated that 81% of shoppers conducted online research before buying. It also found that 30% of shoppers are under the age of 40, and that 20%

of shoppers are under the age of 40 and conducted online research before buying.

a) What percentage of shoppers do not conduct online research before buying?

b) What type of probability is the 20% mentioned above?

c) Construct a contingency table showing all joint and marginal probabilities.

d) What is the probability that a shopper conducted online research before buying given that the shopper is under the age of 40?

e) Are Online Research (conducted before buying) and Age independent? Explain.