# Difference between revisions of "TTest2 Command"

From GeoGebra Manual

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:If ''Pooled'' = false, then population variances are not assumed equal and sample standard deviations are not combined. | :If ''Pooled'' = false, then population variances are not assumed equal and sample standard deviations are not combined. | ||

− | Results are returned in list form as { | + | Results are returned in list form as {Probabilty value, T test statistic}. |

;TTest2[<Sample Mean 1 >,<Sample Standard Deviation 1>, <Sample Size 1>, <Sample Mean 2 >,<Sample Standard Deviation 2 >, <Sample Size 2>, <Tail>,<Boolean Pooled>] | ;TTest2[<Sample Mean 1 >,<Sample Standard Deviation 1>, <Sample Size 1>, <Sample Mean 2 >,<Sample Standard Deviation 2 >, <Sample Size 2>, <Tail>,<Boolean Pooled>] | ||

:Performs a T test of the difference between two population means using the given sample statistics. ''Tail'' and ''Pooled'' are defined as above. | :Performs a T test of the difference between two population means using the given sample statistics. ''Tail'' and ''Pooled'' are defined as above. |

## Revision as of 14:16, 16 August 2012

- TTest2[<List of Sample Data 1>,<List of Sample Data 2>,<Tail>,<Boolean Pooled>]
- Performs a T test of the difference between two population means using the given lists of sample data. Tail has possible values "<", ">" , "≠" that determine the following alternative hypotheses:
- "<" = difference in population means < 0
- ">" = difference in population means > 0
- "≠" = difference in population means ≠ 0

- If
*Pooled*= true, then population variances are assumed equal and sample standard deviations are combined in calculation. - If
*Pooled*= false, then population variances are not assumed equal and sample standard deviations are not combined.

Results are returned in list form as {Probabilty value, T test statistic}.

- TTest2[<Sample Mean 1 >,<Sample Standard Deviation 1>, <Sample Size 1>, <Sample Mean 2 >,<Sample Standard Deviation 2 >, <Sample Size 2>, <Tail>,<Boolean Pooled>]
- Performs a T test of the difference between two population means using the given sample statistics.
*Tail*and*Pooled*are defined as above.