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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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