com.github.chen0040.si.testing

Class TestingOnValueDifference

java.lang.Object

com.github.chen0040.si.testing.TestingOnValueDifference

public class TestingOnValueDifference
extends Object

Created by xschen on 4/5/2017. Hypothesis for difference between two difference population using samples from them H_0: mu_1 == mu_2 in other words values are not different for group1 and group 2 H_A: mu_1 != mu_2 in other words values are different for group1 and group 2

Constructor Summary

Constructors

Constructor and Description
TestingOnValueDifference()

Method Summary

Modifier and Type	Method and Description
String	getSummary()
void	report()
void	run(double xHat1, double xHat2, double s1, double s2, int n1, int n2) The method calculates the p-value for both one-tail and two-tails testing of values from two different population (i.e., groups)
String	toString()
boolean	willRejectH0(double significanceLevel, boolean twoTails) The method reject null hypothesis if the p-value calculated from the sample is smaller than the significance level

Methods inherited from class java.lang.Object

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

Constructor Detail

TestingOnValueDifference

public TestingOnValueDifference()

Method Detail

run

public void run(double xHat1,
                double xHat2,
                double s1,
                double s2,
                int n1,
                int n2)

The method calculates the p-value for both one-tail and two-tails testing of values from two different population (i.e., groups)

Parameters:

xHat1 - the point estimate of the sample mean for population 1

xHat2 - the point estimate of the sample mean for population 2

s1 - the point estimate of the sample standard deviation for population 1

s2 - the point estimate of the sample standard deviation for population 2

n1 - the sample size of sample drawn from population 1

n2 - the sample size of sample drawn from population 2

getSummary

public String getSummary()

toString

public String toString()

Overrides:

toString in class Object

report

public void report()

willRejectH0

public boolean willRejectH0(double significanceLevel,
                            boolean twoTails)

The method reject null hypothesis if the p-value calculated from the sample is smaller than the significance level

Parameters:

significanceLevel - the significance level, usually about 0.05

twoTails - true if the testing is two tails; false otherwise

Returns:

true if the null hypothesis H_0 is rejected; false if H_0 fails to be rejected