Registered Dietitian

Answer: C - A chi-squared test is a measurement of the expected difference between two different data categories, based on a specific hypothesis. It is a commonly used statistical tool in research studies. For example, investigators believe elderly adults attending a workshop about sodium and hypertension will lower their salt intake as a result of participating in the workshop. A chi-squared test can be used to determine whether the salt intake before and after the workshop are statistically different. Chi-square analysis is not used to predict group size or to evaluate the validity and reliability of diet assessment tools such as the food frequency questionnaire.