Manuals/calci/TTEST

TTEST(ar1,ar2,ta,ty)

• $ar1$ and $ar2$ are the array of values.
• $ta$ is the number of distribution tails.
• $ty$ is the type of t-test.

Descrition

• 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 TTEST(ar1,ar2,ta,ty), ar1 and ar2 are two set of array values.
• ta is indicating the number of distribution tails. ta value is either 1 or 2.
• If ta=1,then TTEST uses the one-tailed distrbution.If ta=2, then TTEST uses the two-tailed distrbution.ty is the type of t-Test. ty value is 1 or 2 or 3.

Spreadsheet

ty 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 ar1 and ar2 to find non-negative t-statistic.
• If ta=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 ta=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. ar1 and ar2 have a different number of data points and ty=1.
     2. Any one of the argument is nonnumeric.
     3. ta>2 and ty>3.

Examples

Spreadsheet

	A	B	C	D	E	F	G
1	3	5	14	10	8	2	15
2	11	19	5	4	15	7	3

1. =TTEST(A1:G1,A2:G2,1,1)=0.399108571503
2. =TTEST(A1:G1,A2:G2,2,1)=0.7982171430076
3. =TTEST(A1:G1,A2:G2,1,2)=0.3725946027453
4. =TTEST(A1:G1,A2:G2,2,2)=0.7451892054907
5. =TTEST(A1:G1,A2:G2,1,3) = 0.382340251837
6. =TTEST(A1:G1,A2:G2,2,3) = 0.76468050367
7. =TTEST(A1:G1,A2:G2,2.2,1.3) = NAN

See Also

• TDIST
• TINV

References

• T-test