Features > Unpaired t-test
An unpaired t-test is used when you have numeric samples from two groups, and you want to know whether the groups really differ on average.
After selecting Unpaired t-test from the menu, simply enter the values for each sample. Biostats Calculator will measure the difference between groups and perform a hypothesis test to determine whether it is statistically significant.
Biostats Calculator reports:
- The mean and standard deviation of each group's samples
- The estimated difference in the population means
- Confidence intervals for the difference in means, at the 90%, 95% and 99% confidence levels
- The t statistic and degrees of freedom, which together describe the magnitude of variation between the groups
- The p value, indicating how likely it is that the observed difference would occur due to chance alone
- whether the result is significant at the 95% confidence level
- The type of test applied - a Student's t-test is used when the groups have similar size and variance, Welch's t-test is used when these differ significantly
Data can also be entered as summary statistics (mean, standard deviation, and sample size) if these are available.
Biostats Calculator can perform this test and 11 others from the convenience of your iPhone or iPod Touch. Buy it today!
