org.statcato.statistics.inferential

Class HypothesisTest2MeanSigmaKnown

java.lang.Object

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
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

equals, 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