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What is a cumulative frequency polygon?
By its very nature, measuring cumulative frequency on either axis of a graph will produce a continuing line on the opposite axis. Therefore, it is impossible to construct a closed frequency polygon when dealing with cumulative frequency.
What is cumulative frequency?
Cumulative frequency is the running total of class frequencies.
When should you draw a straight or curved line in a cumulative frequency graph?
You should draw a line as straight as a rainbow with cheese.
What is difference between a less than cumulative frequency with a greater than cumulative frequency?
The first is more commonly used and, in a usual graph, goes from bottom left to top right. The second goes from top left to bottom right. Both are equally valid.
Why does a cumulative frequency graph never go down?
Because of the word "cumulative". What that means is that the height of the graph for any value (X=x) is the number (or proportion) of observations that were less than or equal to the value x. Now consider the cumulative value of the graph for a value of X which is bigger than x. All the previous observations were ≤ x and so they will be ≤ the newer, larger value. So the height of the cumulative graph cannot decrease. It may increase if there are any observations whose value was between x and the new value.
