org.statcato.statistics.inferential

Class CIOnePopMeanSigmaUnknown

java.lang.Object

org.statcato.statistics.inferential.ConfidenceInterval

org.statcato.statistics.inferential.CIOnePopMeanSigmaUnknown

public class CIOnePopMeanSigmaUnknown
extends ConfidenceInterval

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

Since:

1.0

Constructor Summary

Constructors

Constructor and Description
CIOnePopMeanSigmaUnknown(double confidenceLevel, int n, double mean, double s) Constructor.

Method Summary

Modifier and Type	Method and Description
double	criticalValue() Returns the critical value corresponding to the given confidence level.
double	getN() Returns the sample size.
double	getStdev() Returns the sample 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

CIOnePopMeanSigmaUnknown

public CIOnePopMeanSigmaUnknown(double confidenceLevel,
                                int n,
                                double mean,
                                double s)

Constructor.

Parameters:

confidenceLevel - confidence level, between 0 and 1

n - sample size

mean - sample mean

s - sample standard deviation

Method Detail

marginOfError

public double marginOfError()

Returns the margin of error. E = t_(alpha/2) * s / 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 Student's t distribution to find t_(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 sample standard deviation.

Returns:

sample standard deviation

getN

public double getN()

Returns the sample size.

Returns:

sample size