This flowchart will make sure you choose the correct test.
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Is this question discussing proportions?
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1 sample T test
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YES
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NO
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YES
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1 proportion Z test
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YES
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For proportions.
Do I have 1 sample?
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For the mean!
Do I know the population standard deviation?
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NO
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T test.
1 sample?
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NO
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YES
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NO
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2 proportion Z test
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Z test.
1 sample?
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2 sample T test
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YES
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NO
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1 sample Z test
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2 sample Z test
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Which test should I use?
