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    Purpose and Use of the Z-Score

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    I need to explain the z-score, the purpose of it, and how it works, to an individual that has the reading and comprehensive level of a 10 year old (4th grader). Can you give me at least two examples to help him understand,

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    Imagine you have a large group of people. Just by looking at them, we can see how everyone looks different. Some people are short; some people are tall, where the majority of people are 'average height'.

    If you were to record each person's height, and then plot it on a graph, you should get a shape that looks like a bell, called the bell curve. This shows us visually the spread of people's heights.

    As I already stated, not everyone is average height. It is sometimes good to try to understand how different your height is from the 'average' height. This is the basis behind the z-score - it is a mathematically way of calculating how different your height would be from the middle of the bell curve which is the average.

    The ...

    Solution Summary

    The purpose and use of the z-score are examined.