org.statcato.statistics.inferential

Class HypothesisTest2MeanSigmaUnknown

java.lang.Object

org.statcato.statistics.inferential.HypothesisTest2MeanSigmaUnknown

public class HypothesisTest2MeanSigmaUnknown
extends java.lang.Object

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

Since:

1.0

Constructor Summary

Constructors

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

equals, 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 1

n2 - sample size 2

xBar1 - sample mean 1

xBar2 - sample mean 2

s1 - sample standard deviation 1

s2 - sample standard deviation 2

diff - hypothesized difference in population mean

confidenceLevel - confidence level

testType - 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 value

See Also:

HypothesisTest

pValue

public double pValue()

Returns the p-value.

Returns:

p-value