Statistics.ZTest Method

#	Name	Description
1	Data	The data samples to be analyzed.
2	Sigma	The standard deviation to compare the data to.
3	Mean	The mean to value to compare the data to.
4	hRes	Returns the result of the null hypothesis (default assumption is that the means are equal).
5	hType	Defines the type of the null hypothesis (left, right and two - tailed).
6	Signif	(Significance level) returns the probability of observing the given result by chance given that the null hypothesis is true.
7	ConfInt	Returns the 100*(1-Alpha) percent confidence interval for the mean.
8	Alpha	Defines the desired significance level. If the significance probability (Signif) is bellow the desired significance (Alpha), the null hypothesis is rejected.

Returns: Double - Z statistics.

Copyusing Dew.Math;
using Dew.Stats;
using Dew.Stats.Units;
namespace Dew.Examples
{
    private void Example()
    {
        Vector d1 = new Vector(0);
        d1.SetIt(false, new double[] { 3, 3.5, 2, 3.1, 10, 9 });
        double signif, ZStat;
        double[] ci = new double[2];
        THypothesisResult hres;
        // don't use normal approximation
        ZStat = Statistics.ZTest(d1, 5.0, 1.29, out hres, out signif, out ci, THypothesisType.htTwoTailed, 0.05);
        // signif = 0.84940087229; hres = hrNotReject;
        // ci=[4.06780398958, 6.13219601041]
        // Comment : Since the SignRes is greater than Alpha (0.05), the
        // null hypothesis (H0) that data mean is equal to 5.1 cannot be rejected
        // the alternative (Ha) that data mean are NOT equal can therefore be
        // rejected
    }
}