org.statcato.statistics.inferential

Class CIOnePopMeanSigmaKnown

java.lang.Object

org.statcato.statistics.inferential.ConfidenceInterval

org.statcato.statistics.inferential.CIOnePopMeanSigmaKnown

public class CIOnePopMeanSigmaKnown
extends ConfidenceInterval

Confidence interval class for one population mean, sigma (population standard deviation) known.

Since:

1.0

Constructor Summary

Constructors

Constructor and Description
CIOnePopMeanSigmaKnown(double confidenceLevel, int n, double mean, double sigma) Constructor.

Method Summary

Modifier and Type	Method and Description
double	criticalValue() Returns the critical value corresponding to the given confidence level.
int	getN() Returns the sample size
double	getStdev() Returns the standard deviation.
double	marginOfError() Returns the margin of error.

Methods inherited from class org.statcato.statistics.inferential.ConfidenceInterval

center, lowerLimit, toString, upperLimit

Methods inherited from class java.lang.Object

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

Constructor Detail

CIOnePopMeanSigmaKnown

public CIOnePopMeanSigmaKnown(double confidenceLevel,
                              int n,
                              double mean,
                              double sigma)

Constructor.

Parameters:

confidenceLevel - confidence level, between 0 and 1

n - sample size

mean - sample mean

sigma - sample standard deviation

Method Detail

marginOfError

public double marginOfError()

Returns the margin of error. E = z_(alpha/2) * sigma / sqrt(n).

Specified by:

marginOfError in class ConfidenceInterval

Returns:

margin of error

criticalValue

public double criticalValue()

Returns the critical value corresponding to the given confidence level. Uses the z distribution to find z_(alpha/2), where alpha is the significance level (1 - confidence level).

Specified by:

criticalValue in class ConfidenceInterval

Returns:

critical value

getStdev

public double getStdev()

Returns the standard deviation.

Returns:

standard deviation

getN

public int getN()

Returns the sample size

Returns:

sample size