Researcher Team 2T-TestDefinition of T-TestA t-test is an analysis of two population means through the use of statisticalexamination; a t-test with two samples is commonly used with small sample sizes,testing the difference between the samples when the variances of two normaldistributions are not known.The t-test is any statistical hypothesis test in which the test statistic followsa Student’s t distribution under the null hypothesis.●Proposed by William Sealy GossetStatistician for Guinness breweryin Dublin, IrelandPurpose: cheaply monitor the quality of beer brews●Published in Biometrika in 1908 (now 109 years old) but was forced to use a penname, “Student’s T-test”3 Types of t-test1.Independent sample t-test- used to compare two means for situation in whicheach participant is assigned to only one condition.2.Paired sample t-test- used to compare two means for situations in which everyparticipant is in both samples.