# Difference between revisions of "TTest2 Command"

From GeoGebra Manual

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− | ;TTest2[<List of Sample Data 1>,<List of Sample Data 2>,<Tail>,<Boolean Pooled>]:{ | + | ;TTest2[<List of Sample Data 1>,<List of Sample Data 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 list of sample data. ''Tail'' has possible values "<", ">" , "≠". These specify the alternative hypothesis as follows. |

+ | :: "<" = 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 {P 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. |

## Revision as of 05:33, 23 July 2011

- 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 list of sample data.
*Tail*has possible values "<", ">" , "≠". These specify the alternative hypothesis as follows.- "<" = 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 {P 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.