Hypothesis tests tell us whether patterns we observe in sample data are likely to be real (caused by patterns in the population) or due to chance.
Hypothesis testing is a powerful tool, but the statistics involved is often complex. Biostats Calculator performs the most common hypothesis tests automatically and presents the results in a clear and easy-to-understand way.
The result of a hypothesis test is a p value. This is the probability that random chance would cause the pattern that was observed.
Typically, a p value of less than 0.05 is regarded as evidence that a real relationship exists. This is known as the 95% confidence level, and Biostats Calculator indicates this by turning green if the relationship is significant, and red if it is not.
Of course, Biostats Calculator also reports the p value for all hypothesis tests, so you are free to use a different criterion.