DEFINITION of 'TTest'
A statistical examination of two population means. A twosample ttest examines whether two samples are different and is commonly used when the variances of two normal distributions are unknown and when an experiment uses a small sample size. For example, a ttest could be used to compare the average floor routine score of the U.S. women's Olympic gymnastic team to the average floor routine score of China's women's team.
INVESTOPEDIA EXPLAINS 'TTest'
The test statistic in the ttest is known as the tstatistic. The ttest looks at the tstatistic, tdistribution and degrees of freedom to determine a p value (probability) that can be used to determine whether the population means differ. The ttest is one of a number of hypothesis tests. To compare three or more variables, statisticians use an analysis of variance (ANOVA). If the sample size is large, they use a ztest. Other hypothesis tests include the chisquare test and ftest.

PTest
A statistical method used to test one or more hypotheses within ... 
Population
The entire pool from which a statistical sample is drawn. The ... 
Simple Random Sample
A subset of a statistical population in which each member of ... 
ZTest
A statistical test used to determine whether two population means ... 
PValue
The level of marginal significance within a statistical hypothesis ... 
Distribution
1. When trading volume is higher than that of the previous day ...

Fundamental Analysis
Find The Right Fit With Probability ...

Personal Finance
What is the average salary for an accountant?

Fundamental Analysis
Lognormal and Normal Distribution

Economics
Where is cost of living lowest in the ...