TTEST

Returns the probability associated with t-test. Determines whether two samples are likely to have come from the same two underlying populations that have the same mean.

Sample Usage

TTEST(A1:A4, B1:B4, 2, 1)

Syntax

TTEST(range1, range2, tails, type)

  • range1 - The first sample of data or group of cells to consider for the t-test.

  • range2 - The second sample of data or group of cells to consider for the t-test.

  • tails - Specifies the number of distribution tails.

    • If 1: uses a one-tailed distribution.

    • If 2: uses a two-tailed distribution.

  • type - Specifies the type of t-Test.

    • If 1: a paired test is performed.

    • If 2: a two-sample equal variance (homoscedastic) test is performed.

    • If 3: a two-sample unequal variance (heteroscedastic) test is performed.

Notes

  • tails and type must be numeric.

  • range1 and range2 must have the same number of data points.

  • TTEST uses the data in range1 and range2 to compute a non-negative test. If tails is set to 1, TTEST returns the probability of a higher value of the t-statistic under the assumption that range1 and range2 are samples from populations with the same mean. The value returned by TTEST when tails is set to 2 is double that returned when tails is set to 1 and corresponds to the probability of a higher absolute value of the t-statistic under the "same population means" assumption.

  • You can use TTEST or T.TEST to perform this function. 

Examples

In this example, a paired, two-tailed t-Test is computed on a student's first and second quarter grades.

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