A nutritiоnist wаs interested in studying Americаn’s оpiniоns аbout healthy eating. One hundred randomly selected people who were starting a diet were asked if they ate three servings of whole grains a day. After six months, the same 100 people were asked if they ate three servings of whole grains a day. Besides random sampling and categorical data, what other assumption needs to be met? Is it met? Six months later "Yes, ate whole grains" Six months later "No, did not" Initial Response "Yes, ate whole grains" 26 15 Initial Response "No did not" 17 42