HypothesisTest1Var







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org.statcato.statistics.inferential

Class HypothesisTest1Var

java.lang.Object
org.statcato.statistics.inferential.HypothesisTest1Var



public class HypothesisTest1Varextends java.lang.Object



A hypothesis test for 1 population variance




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











Constructor Summary


HypothesisTest1Var(int n,
double sigma2,
double confidenceLevel,
int testType)


          Constructor.


 






Method Summary



 java.lang.String
criticalValue()


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



 double
pValue(double s2)


          Returns the p-value corresponding to s2 in a chi-square distribution.



 double
testStatistics(double s2)


          Returns the test statistics for the given sample variance s2.


 


Methods inherited from class java.lang.Object


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


 








Constructor Detail




HypothesisTest1Var

public HypothesisTest1Var(int n,
double sigma2,
double confidenceLevel,
int testType)

Constructor.


Parameters:n - sample sizesigma2 - hypothesized varianceconfidenceLevel - confidence leveltestType - (as defined in HypothesisTest)








Method Detail




testStatistics

public double testStatistics(double s2)

Returns the test statistics for the given sample variance s2. X2 = (n-1)^2 * s2 / sigma2


Parameters:s2 - hypothesized population variance
Returns:test statistic X2 (chi-square)





criticalValue

public java.lang.String criticalValue()

Returns the critical value corresponding to the given confidence level and type of test. Uses the chi-square distribution.



Returns:critical valueSee Also:HypothesisTest





pValue

public double pValue(double s2)

Returns the p-value corresponding to s2 in a chi-square distribution.


Parameters:s2 - variance
Returns:p-value















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