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A frequency distribution in which the data is only nominal or ordinal. Ungrouped Frequency Distribution. A frequency distribution of numerical data. The raw data is not grouped. Grouped Frequency Distribution. A frequency distribution where several numbers are grouped into one class.
T DISTRIBUTION. A FAMILY OF BELL SHAPED CURVES BASED ON DEGREES OF FREEDOM SIMILAR TO THE STANDARD NORMAL DISTRIBUTION WITH THE EXCEPTION THAT THE VARIANCE IS GREATER THAN 1. USED WHEN YOU ARE TESTING SMALL SAMPLES AND WHEN THE POPULATION STANDARD DEVIATION IS UNKNOWN. UNBIASED ESTIMATOR.