Frequent Food Questionnaires (FFQs) Are Often Given to Large Groups

Multiple Choice

Frequent food questionnaires (FFQs) are often given to large groups of people to obtain information on their dietary habits. Study participants are asked about the frequency with which they consume certain goods. Another method to obtain information on foods consumed is a food diary. People are asked to record every type of food and amount consumed for a few days. Food diaries are more difficult to obtain and response rates are lower than for FFQs. A study was conducted to see how well FFQs predict food consumed based on food diaries. In this study, the explanatory variable is:

A) the amount of food consumed.
B) the amount of food consumed according to the food diary.
C) the amount of food consumed according to the FFQ.
D) dependent on the response.