A group of statistical procedures that researchers use to test data that are not normally distributed. Also see distribution. Standardized scores that have been developed using a group from a population. Norms exist for many tests and questionnaires that are used in mental health research. A formal statement that there is no difference or no relationship between variables.
Researchers often use the results of statistical test to reject the null hypothesis.
An individual or event is watched for a specified length of time. A characteristic or measure of a population. A group of statistical procedures that researchers use to test data that are normally distributed. Also see distribution. A smaller version of a study is carried out before the actual investigation is done.