A Researcher Is Interested in Investigating 3 Types of Interventions

Multiple Choice

A researcher is interested in investigating 3 types of interventions designed to increase physical activity.The independent variable is the type of intervention and the dependent variable is amount of physical activity,measured in minutes per week.If this researcher wanted to use chi-square to analyze the data,what modification would need to be made?

A) Formulas utilizing degrees of freedom need to be modified to N-3.
B) Subtract .5 from each of the differences between the observed and expected values.
C) At least double the amount of data should be collected.
D) The dependent variable needs to be collapsed into categories.