State the test hypotheses.
Let first population denote the treatment and the second population denote the placebo.
The test statistic formula is,
With degrees of freedom
denotes the first sample mean,
denotes the first sample standard deviation,
denotes the first sample size,
denotes the second sample mean,
denotes the second sample standard deviation,
denotes the second sample size,
denotes the first sample population mean, and
denotes the second sample population mean.
The pooled sample variance is,
in the test statistic formula
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