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Frequency distribution
A frequency distribution is a series where a number of items with similar values are put in separate groups or bunches. In other words a frequency distribution is a table in which the data ground into classes are recorded. In the words of croxton and Cowden frequency distribution is a statistical table which show the set of all distinct values or sizes or measurements, and on its right the number of times the value is repeated which is called number of items or frequency or number of observations. Formation of a discrete frequency distribution.
The process of preparing discrete frequency distribution ia as under:
(1) All value from lowest to the highest be placed in Column no.
(2) Put a tally bar vertical line opposite the value to which it realates. To facilitate counting sets of five tally bars is prepared and some space is left between two sets of tallies.
(3) Then finally the number of tallies are canted and frequency for each size or value is obtained.
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X 110 120 130 120 140 135 155 160 165 155 Y 12 18 20 15 25 30 35 20 25 10
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Random Sampling Method In this method the units are selected in such a way that every item in the whole universe has an equal chance of being included. In the words of croxton
HOW WOULD YOU INTERPRET THIS PROBABILITY:P(a)=1.05
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