org.statcato.statistics.inferential

Class CIOnePopProp

java.lang.Object

org.statcato.statistics.inferential.ConfidenceInterval

org.statcato.statistics.inferential.CIOnePopProp

public class CIOnePopProp
extends ConfidenceInterval

Confidence interval class for one population proportion.

Since:

1.0

Field Summary

Fields

Modifier and Type	Field and Description
static int	BINOMIAL
static int	NORMAL

Constructor Summary

Constructors

Constructor and Description
CIOnePopProp(double confidenceLevel, int n, double p, int type) Constructor

Method Summary

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

Field Detail

NORMAL

public static int NORMAL

BINOMIAL

public static int BINOMIAL

Constructor Detail

CIOnePopProp

public CIOnePopProp(double confidenceLevel,
                    int n,
                    double p,
                    int type)

Constructor

Parameters:

confidenceLevel - confidence level, between 0 and 1

n - sample size

p - sample proportion

type - type of distribution for calculating critical value

Method Detail

marginOfError

public double marginOfError()

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