Comparing Two Population Means
Example
Comparative Observational Study
Graphical summary of sample data
Numerical summary of sample data
The Question in Statistical Notation
All possible questions in statistical notation
Set up hypotheses
Make initial assumption
Determine the P-value
Make a decision
How the P-value is calculated
If variances of the measurements of the two groups are not equal...
If variances of the measurements of the two groups are equal...
Two-sample t-test in Minitab
Pooled two-sample t-test
(Unpooled) two-sample t-test
Assumptions for correct P-values
Confidence interval for difference in two means
Interpreting a confidence interval for the difference in two means…
Two-sample confidence interval in Minitab
Randomized comparative experiment
Graphical summary of data
Two-sample t-test results
Conclusions of Turkey experiment
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