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# T and Z calculations represented on a bell curve

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T and Z tests are parametric tests that are designed to measure the differences in behavior between a sample population and a universal population. How is the T/Z calculation represented on a bell curve? Is it a standard deviation or variance?

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The expert determines how T/Z calculations are represented on a bell curve. Whether it is a standard deviation or a variance is determined.

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The t and z calculations are very similar, with the only difference in the calculations being that t uses the sample standard deviation while z uses the population standard deviation.

When t is calculated for small sample ...

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