org.statcato.statistics.inferential
Class CIMatchedPairs

java.lang.Object
  extended by org.statcato.statistics.inferential.ConfidenceInterval
      extended by org.statcato.statistics.inferential.CIMatchedPairs

public class CIMatchedPairs
extends ConfidenceInterval

Confidence interval class for matched pairs.

Since:
1.0
Version:
%I%, %G%
Author:
Margaret Yau

Field Summary
 
Fields inherited from class org.statcato.statistics.inferential.ConfidenceInterval
center, confidenceLevel
 
Constructor Summary
CIMatchedPairs(double confidenceLevel, int n, double mu, double s)
          Constructor.
 
Method Summary
 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
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

CIMatchedPairs

public CIMatchedPairs(double confidenceLevel,
                      int n,
                      double mu,
                      double s)
Constructor.

Parameters:
confidenceLevel - confidence level, between 0 and 1
n - sample size (number of matched pairs)
mu - sample mean of differences
s - sample standard deviation of differences
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 the 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