Researchers use these statistics to describe the most typical scores in a set of data. A statistic used to compare frequencies of two or more groups. Researchers often use chi-squares to test nominal data. Also see nominal scale. A research design used to test the effects of a treatment such as a therapy approach or medication.
Researchers compare treatment group results with control group results.
Also see control group. A statistic that represents reliability or internal consistency. They also use this statistic to evaluate whether the items measure the same characteristic at different points in time and in different samples. Also known as Cronbach's alpha. Data or variables that differ by amounts or degrees.