The two-sample t-test is one of the most commonly used hypothesis tests in Six Sigma work. It is applied to compare the average difference between two groups. You use it to determine if the ...

Course TopicsMotivation: Frequently, comparing samples from two populations is of interest. For example, is the average height in the US different from that in China? If they are different, how ...

Learn how two-tailed tests determine statistical significance in hypothesis testing by evaluating if a sample differs from a population mean. Discover real-world applications.

G. A. Barnard, Comparing the Means of Two Independent Samples, Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 33, No. 3 (1984), pp. 266-271 ...

An investigator wishes to compare two independent proportions, based on perhaps unequal sample sizes, by means of the chi squared test with the Yates' correction. A simple approximation is given to ...