Manuals/calci/TTEST

TTEST(Array1,Array2,Tails,Type)

$Array1$ and $Array2$ are the array of values.
$Tails$ 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.