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2-Sample tStat > Basic Statistics > 2-Sample t
Performs an independent 2-sample t-test and generates a confidence interval.
When you have dependent samples, use Stat > Basic Statistics > Paired t.
Use 2-Sample t to perform a hypothesis test and compute a confidence interval of the difference between two population means when the population standard deviations, s's, are unknown. For a two-tailed 2-sample t
H0: m 1 - m 2 = d 0 versus H1: m 1 - m 2 ≠ d 0
where m 1 and m 2 are the population means and d 0 is the hypothesized difference between the two population means.
Both samples are in one column: Choose if the sample data are in a single column, differentiated by sample IDs in a second column.
Samples: Enter the column containing the data.
Sample IDs: Enter the column containing the sample IDs.
Each sample is in its own column: Choose if the data of the two samples are in separate columns.
Sample 1: Enter the column containing one sample.
Sample 2: Enter the column containing the other sample.
Summarized data: Choose if you have summary values for the sample size, mean, and standard deviation for each sample.
Sample 1
Sample size: Enter the value for the sample size.
Sample mean: Enter the value for the mean.
Standard deviation: Enter the value for the standard deviation.
Sample 2
Sample size: Enter the value for the sample size.
Sample mean: Enter the value for the mean.
Standard deviation: Enter the value for the standard deviation.