HT and CI for comparing 2 samples (paired)
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First, go to Stat, Basic Statistics, Paired t.
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The following screen will appear.
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Enter your samples in First and Second Sample.
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Make sure that you realize that this is computing
xbar1 - xbar2
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To Compute a Hypothesis Test
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Don't worry about the confidence level box.
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Fill in the test mean in the box. Most likely this number will be equal
to zero.
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Chose the alternative that matches your alternative hypothesis.
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To Compute a Confidence Interval or Bound.
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Enter your level of confidence.
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Do not worry about the blank for test mean
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Next pick the alternative that matches your alternative hypothesis.
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If you want a two sided test, select "not equal" as your alternative.
If you want a one sided test, , select "less than" or "greater
than".
Note: Your screen may look a little different; however,
you should have the same boxes to fill in for Confidence and Alternative.
Paired T-Test and CI: Normal, High
Paired T for Normal - High
N Mean StDev
SE Mean
Normal
15 47.89 3.93
1.01
High
15 90.12 1.96
0.51
Difference 15
-42.23 4.34
1.12
95% CI for mean difference: (-44.63, -39.83)
T-Test of mean difference = 0 (vs not = 0): T-Value = -37.72
P-Value = 0.000