Descriptive Statistics: Tabular and Graphical Methods

5 important questions on Descriptive Statistics: Tabular and Graphical Methods

What formula is used to compute a class length:

 ( largest measurement - smalles measurement ) / Classes

How do you calculate the length of a class

Count the amount of data. This should fit into a 2^k. So for example 65 measurements fits in 2ˆ7. Because 2^6 =64, which would be too less, therefore use 2^8=128 which is obviously more suitable. 

How is this picture skewed?

Skewed to the left
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How is the diagram displayed in the picture called?

Stem and leaf plot

What type of diagram does the picture display?

A scatter plot

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