Question

Variance for accumulator. Validate that the following code, which adds the

Answer 1

Using the knowledge of computational language in JAVA it is possible to write a code that Validate that the following code, which adds the methods var() and stddev() to Accumulator, computes both the mean and variance of the numbers presented as arguments to addDataValue()

Writting the code:

import java.util.*;

public class Accumulator {  

private static double m;  

private static double v;  

private static double st;  

private static  double s[]=new double[5];

private static int N;

private static int count =0;

public static void main(String[] args) {

// TODO Auto-generated method stub

Random r = new Random();

System.out.println("hello world");

for(int i=0;i<5;i++) {

   double randomvalue = r.nextDouble();

addDataValue(randomvalue);

}

for(int i=0;i<s.length;i++) {

   System.out.println("dataValue:"+s[i]);

}  

mean();

System.out.println("mean:"+m);

var();

System.out.println("variance:"+v);

stddev();

System.out.println("standard deviation:"+st);

}

public  static void addDataValue(double value) {     // addes data values to array

 s[count]=value;

 count++;

}

public static double mean() {        // returns mean

double sum=0.0;

for(int i=0;i<s.length;i++) {

   sum+=s[i];

}

m = sum/s.length;

return m;

}  

public static double var() {    //returns variance

double mm = mean();

    double t = 0;

    for(int i=0;i<s.length;i++) {

        t+= (s[i]-mm)*(s[i]-mm);

}

    v= t/(s.length-1);

     return v;  

}

public static  double stddev() {        // returnsn the stardard deviation

st= Math.sqrt(var());

return st;

}

}

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