HypothesisTest2MeanSigmaUnknown







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org.statcato.statistics.inferential

Class HypothesisTest2MeanSigmaUnknown

java.lang.Object
org.statcato.statistics.inferential.HypothesisTest2MeanSigmaUnknown



public class HypothesisTest2MeanSigmaUnknownextends java.lang.Object



A hypothesis test for 2 population means (population standard deviations sigmas unknown).




Since:
1.0
Version:
%I%, %G%
Author:
Margaret Yau











Constructor Summary


HypothesisTest2MeanSigmaUnknown(int n1,
int n2,
double xBar1,
double xBar2,
double s1,
double s2,
double diff,
double confidenceLevel,
int testType,
boolean varEqual)


          Constructor.


 






Method Summary



 java.lang.String
criticalValue()


          Returns the critical value corresponding to the given confidence level and type of test.



 int
DOF()


          Returns the degree of freedom.



 double
pValue()


          Returns the p-value.



 double
testStatistics()


          Returns the test statistics.


 


Methods inherited from class java.lang.Object


clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait


 








Constructor Detail




HypothesisTest2MeanSigmaUnknown

public HypothesisTest2MeanSigmaUnknown(int n1,
int n2,
double xBar1,
double xBar2,
double s1,
double s2,
double diff,
double confidenceLevel,
int testType,
boolean varEqual)

Constructor.


Parameters:n1 - sample size 1n2 - sample size 2xBar1 - sample mean 1xBar2 - sample mean 2s1 - sample standard deviation 1s2 - sample standard deviation 2diff - hypothesized difference in population meanconfidenceLevel - confidence leveltestType - type of test (as defined in HypothesisTest)varEqual - whether population variances are assumed equal








Method Detail




testStatistics

public double testStatistics()

Returns the test statistics.



Returns:test statistic t score





DOF

public int DOF()

Returns the degree of freedom.



Returns:degree of freedom





criticalValue

public java.lang.String criticalValue()

Returns the critical value corresponding to the given confidence level and type of test. Uses the Student's t distribution.



Returns:critical valueSee Also:HypothesisTest





pValue

public double pValue()

Returns the p-value.



Returns:p-value















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