# Manuals/calci/TTEST

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**TTEST(Array1,Array2,Tails,Type)**

- and are the array of values.
- is the number of distribution tails.
- is the type of t-test.
- TTEST() returns the probability associated with a Students t-test.

## Description

- This function gives the probability of the t-test.
- It is also called student's t-test.
- This function is used to find the probability of two samples having the same mean but equal or unequal variances.
- In , and are two set of array values.
- ta is indicating the number of distribution tails. ta value is either 1 or 2.
- If Tails=1,then TTEST uses the one-tailed distribution.If Tails=2, then TTEST uses the two-tailed distribution. Type is the type of t-Test. Type value is 1 or 2 or 3.

Type value | t-Test is performed |

1 | Paired |

2 | Two-sample equal variance |

3 | Two-sample unequal variance |

- Suppose we are giving ta and ty in decimals , then it will converted in to integers.
- TTEST uses the value of Array1 and Array2 to find non-negative t-statistic.
- If Tails=1, then it gives the probability of a higher value of the t-statistic with consideration of two arrays of samples with the same mean.
- If Tails=2, then TTEST is gives double that when ta=1 and corresponds to the probability of a higher absolute value of the t-statistic with the consideration of same mean.

This function will give the result as error when

1. Array1 and Array2 have a different number of data points and Type=1. 2. Any one of the argument is nonnumeric. 3. Tails>2 and Type>3.

## Examples

A | B | C | D | E | F | G | |
---|---|---|---|---|---|---|---|

1 | 3 | 5 | 14 | 10 | 8 | 2 | 15 |

2 | 11 | 19 | 5 | 4 | 15 | 7 | 3 |

- =TTEST(A1:G1,A2:G2,1,1)=0.399108571503
- =TTEST(A1:G1,A2:G2,2,1)=0.7982171430076
- =TTEST(A1:G1,A2:G2,1,2)=0.3725946027453
- =TTEST(A1:G1,A2:G2,2,2)=0.7451892054907
- =TTEST(A1:G1,A2:G2,1,3) = 0.37285157760157517
- =TTEST(A1:G1,A2:G2,2,3) = 0.7457031552031503
- =TTEST(A1:G1,A2:G2,2.2,1.3) = NAN

## Related Videos

## See Also

## References