Student's t-test
Student's t -test 35 languages Article Talk Read Edit View history Tools From Wikipedia, the free encyclopedia A t -test is a type of statistical analysis used to compare the averages of two groups and determine whether the differences between them are more likely to arise from random chance. It is any statistical hypothesis test in which the test statistic follows a Student's t -distribution under the null hypothesis . It is most commonly applied when the test statistic would follow a normal distribution if the value of a scaling term in the test statistic were known (typically, the scaling term is unknown and is therefore a nuisance parameter ). When the scaling term is estimated based on the data , the test statistic—under certain conditions—follows a Student's t distribution. The t -test's most common application is to test whether the means of two populatio...