org.statcato.statistics.inferential

Class HypothesisTest1MeanSigmaUnknown

java.lang.Object

org.statcato.statistics.inferential.HypothesisTest1MeanSigmaUnknown

public class HypothesisTest1MeanSigmaUnknown
extends java.lang.Object

A hypothesis test for 1 population mean, population standard deviation unknown.

Since:

1.0

Constructor Summary

Constructors

Constructor and Description
HypothesisTest1MeanSigmaUnknown(int n, double mu, double s, 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(double xBar) Returns the p-value corresponding to xBar in a t distribution.
double	testStatistics(double xBar) Returns the test statistics for the given sample mean xBar.

Methods inherited from class java.lang.Object

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

Constructor Detail

HypothesisTest1MeanSigmaUnknown

public HypothesisTest1MeanSigmaUnknown(int n,
                                       double mu,
                                       double s,
                                       double confidenceLevel,
                                       int testType)

Constructor.

Parameters:

n - sample size

mu - hypothesized mean

s - sample standard deviation

confidenceLevel - confidence level

testType - (as defined in HypothesisTest)

Method Detail

testStatistics

public double testStatistics(double xBar)

Returns the test statistics for the given sample mean xBar.

t = (xBar - mu) / (s / sqrt(n))

Parameters:

xBar - sample mean

Returns:

test statistic z score

criticalValue

public java.lang.String criticalValue()

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

Returns:

critical value

See Also:

HypothesisTest

pValue

public double pValue(double xBar)

Returns the p-value corresponding to xBar in a t distribution.

Parameters:

xBar - x bar

Returns:

p-value p-Value corresponding to xBar