org.statcato.statistics.inferential
Class HypothesisTest2MeanSigmaKnown

java.lang.Object
  extended by org.statcato.statistics.inferential.HypothesisTest2MeanSigmaKnown

public class HypothesisTest2MeanSigmaKnown
extends java.lang.Object

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

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

Constructor Summary
HypothesisTest2MeanSigmaKnown(int n1, int n2, double xBar1, double xBar2, double sigma1, double sigma2, double diff, 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()
          Returns the p-value in a z distribution.
 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

HypothesisTest2MeanSigmaKnown

public HypothesisTest2MeanSigmaKnown(int n1,
                                     int n2,
                                     double xBar1,
                                     double xBar2,
                                     double sigma1,
                                     double sigma2,
                                     double diff,
                                     double confidenceLevel,
                                     int testType)
Constructor

Parameters:
n1 - sample size 1
n2 - sample size 2
xBar1 - sample mean 1
xBar2 - sample mean 2
sigma1 - population standard deviation 1
sigma2 - population standard deviation 2
diff - hypothesized difference in population mean
confidenceLevel - confidence level
testType - type of test (as defined in HypothesisTest)
Method Detail

testStatistics

public double testStatistics()
Returns the test statistics.

Returns:
test statistic t score

criticalValue

public java.lang.String criticalValue()
Returns the critical value corresponding to the given confidence level and type of test. Uses the z distribution.

Returns:
critical value
See Also:
HypothesisTest

pValue

public double pValue()
Returns the p-value in a z distribution.

Returns:
p-value