| Significance Test of the Difference of Means |
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| q | If we draw two samples from one population and obtain two different |
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| means, how do we estimate the significance of the difference between |
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| these two sample means? |
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| q | If we repeat these pair-sampling many many times, the probability |
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| distribution for the mean difference will be a normal
distribution with a |
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| mean of zero and a standard deviation of: |
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| q | Test the null hypothesis that the samples come from the same |
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| population ( m1= m2 as
well as s1= s2) use
the t-distribution
with |
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| v = N1 + N2 - 1 |
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