T Statistic Calculator (T-Value)

Enter the sample mean, the population mean, standard deviation, and sample size into the t statistic calculator to determine the t-value of that set of data.

• Z-score calculator
• Average Rating Calculator
• Coefficient of Variation Calculator
• Relative Error Calculator
• Coefficient of Skewness Calculator

T Statistic Formula

The following formula can be used to calculate the t statistic of a data set.

t = [ x – μ> ] / [ s / sqrt( n ) ]

• Where X is the sample mean
• μ is the population mean
• s is the standard deviation of the sample
• n is the sample size

The most important point to note about this formula is that the standard deviation is of the sample, not the entire population.

T Statistic Definition

A t statistic is a statistic that defines the relationship between a sample and a population. In other words a measure of the accuracy of a sample.

How to calculate t statistic?

Example Problem:

First, determined the sample mean. For this example problem, the sample mean is found to be 45.

Next, determine the population mean. In this case, the population mean is calculated to be 50.

Next, determine the standard deviation of the sample. For this problem, the standard deviation of the sample (important to note this is not the sample deviation of the population), is found to be 2.5.

Next, determine the sample size. The sample size for this example is 400.

Finally, calculate the t-statistic using the formula above:

t = [ x – μ> ] / [ s / sqrt( n ) ]

t = [ 50 – 45 ] / [ 2.5 / sqrt( 400 ) ]

t = 40

FAQ

---