Construct a contingency table using cola preference (Rola or Koka) as the row variable and sweetness preference (very sweet, sweet, or not so sweet) as the column variable. Based on the table, answer the following:
a. How many shoppers who preferred Rola-Cola in the blind taste test said that they preferred a cola drink to be either very sweet or sweet?
b. How many shoppers who preferred Koka-Cola in the blind taste test said that they preferred a cola drink to be not so sweet?
c. What kind of relationship, if any, seems to exist between cola preference and sweetness preference?