Difference Between T-Test and P-Value

In the world of statistics, calculations, assumptions, and conclusions prevail. Amongst all the tests and results, t-tests and p-value are the two most confusing assumption techniques.

While the two are found in the same subset of statistics and provide a further measure of assumption along with being interlinked. The two tests are not the same!

T-Test vs P-Value

The main difference between T-test and P-Value is that a T-Test is used to analyze the rate of difference between the means of the samples, while p-value is performed to gain proof that can be used to negate the indifference between the averages of two samples.

T Test VS P Value

T-test provides the difference between two measures within a normal range, whereas p-value focuses on the extreme side of the sample and thus provides an extreme result.

Despite being interrelated the two show diverse aspects of a sample and determine different parameters of the population from which the samples are deduced.  


Comparison Table Between T-Test and P-Value (in Tabular Form)

Parameter of ComparisonT-TestP-Value
Full formTest statisticProbability value
Statistics branchInferential statisticsInferential statistics
Hypothesis TestingYesYes
Averages of samplesAlternatingNull-Same
ResultDifference in meanNegating Null assumptions


What is T-Test?

A T-Test is a statistical test that determines the rate of difference between the averages of two related sets. It falls in the category of statistics which relates to predictions from a sample of a population.

The T-test can be performed on a set of data that is co-related in some way; the common feature might be the age, area, service provision, or any such factor. Two dissimilar assumptions cannot be used for T analysis.

Samples should be nominated randomly to deduce the result of the T-test. While the sample size should be such which looks like standard dispersal, with both the sets having values spread across the average value in the same proportion.

The three famous types of t-Tests are; paired sample model, one sample, and independent two-sample tests.

The paired sample test is when the test is conducted over the same sample at different times. This is to deduce the impact the diverse external factors have on the sample. A comparison of the productivity of workers in day hours with that of the night hours can be done using a one-sample t-test.

Single sampling when one factor of a certain thing is compared with the standard provided. Comparison of the average life of the light bulb and their comparison with a sample of light bulbs to deduce the competency of average can be done through this measure.

An autonomous sample test is a name given; when a certain factor from the samples is taken; two different sets of data from two dissimilar samples are taken out. IQ levels between male and female students can be deduced using this method.

This comparison helps the user to decipher the relation between two sets of data, or to comprehend the truth behind the stated standards.


What is P-Value?

P-value is the assumption test used to negate the fact that the means of two samples have no difference.

Alpha is the term used to describe a pre-determined probability while p-value is the term used for the probability which is calculated after a thorough analysis of the population and the sample.

Opposite to a null or no difference hypothesis is the fluctuating or the alternate mean, in such a case if the resulting p-value is less than the most noteworthy figure than the static hypothesis is rejected.

In certain cases the same hypothesis is wrongly rejected; it is done in instances when in reality the null supposition is true but as the substantial number is higher than the p-value it is rejected.

In the other case, the hypothesis is wrongly accepted. Despite a difference being readily shown it is believed that this is due to external issues and is not because of any measurements or such indicators.

A smaller p-value means that the impact it has on the entire sample is of a higher magnitude and significance.

If the p-value is of such a trivial nature that eventually it has to be declared that the means have no difference; than in such a case, the tests and results of the entire test are considered to be inconsequential.

Main Differences Between T-Test and P-Value

An ardent look shows the major differences between T-test and P-value:

  1. While the T-test determines the difference between the averages of two sets of values. Whereas p-value shows the probability between the difference of averages between two particular sets.
  2. P-value calculates the probability of samples whose averages are the same while the t-test is performed on samples with different averages.
  3. P-value looks into the minutest difference between the averages which looks the same while t-test though is performed on a small sample the averages need to have a remarkable difference.
  4. The sample size impacts the P-value, the larger the sample the lower the value. While the t-value deduced as a result of the t-test is directly proportional to the sample size, the larger the sample the higher the value.
  5. The result of the t-test is said to be directly pertinent to the entire population, while in the case of p-value this statement is not true!



Assumptions regarding a population and its constraints are a vital part of the analytical branch of statistics, while sampling and assumptions are made in the initial stage.

T-testing and the calculation of p-value form the vital stage after which further calculations are conclusions are constructed.

The former two tests give a clear idea regarding the sample selected and the eventual population regarding whom an assumption for testing is developed.

The results of both the test form an integrated part of statistics and thus it is highly important to understand the significant difference between the two.


  1. https://amstat.tandfonline.com/doi/abs/10.1198/tast.2010.08261
  2. https://www.ajol.info/index.php/aipm/article/view/64038
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