QMS 102 Lecture Notes - Cumulative Frequency Analysis, Minimax, Decimal Mark

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Advantages of using frequency distribution table is concentrated/clustered) Number of classes: use 5 to 10 classes in frequency distribution table all have same length. Notion for indicating classes: use expressions such as: Greater or equal than 40 and less than 50 . Cw = upper boundary lower boundary all classes must be the same width no gaps in between classes first and last class must contain frequencies (lowest = first value, highest = last value) Class width = (max min)/5, absolute min. number of classes = 5, but greater than 5, if told so. Estimated class width: value obtained from (max-min)/5 or (max-min)/min # of classes recommended. Always one of the two recommended class widths (from the list of nice #s) that encloses the estimated class width. Given a sample size n denoted by: f = frequency (total # of occurrences of data within the class) rf = relative frequency is defined as rf = f/n.

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