Regression

Cant seem to figure out the correlation portion and the standard deviation portion either. Could use some help. Thank you all very much.

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.Scanner;

public class Regression {

    public static double findingMin (double [] a )
    {
        double min = a[0];
        for (int i = 1; i < a.length; i++)
        {
            if (min < a[i])
                min = a[i];
        }
        return min;
    }

    public static double findingMax ( double [] b )
    {
        double max = b[0];
        for (int i = 1; i < b.length; i++ )
        {
            if (max > b[i])
                max = b[i];
        }
        return max;
    }

    public static void main(String[] args) throws FileNotFoundException {

        Scanner input = new Scanner(new File("/home/fjgottshalk/Downloads/cricket.txt"));

    int numb = 15;
    double [] chirp = new double[numb];
    double [] temp = new double[numb];

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

        chirp[i] = input.nextDouble();
        temp[i] = input.nextDouble();

    }
        double xMin = findingMin(chirp);
        double xMax = findingMax(chirp);
        double yMin = findingMin(temp);
        double yMax = findingMax(temp);

        StdDraw.setPenRadius(0.01);
        StdDraw.setXscale(xMin, xMax);
        StdDraw.setYscale(yMin, yMax);

        for (int i = 0; i < numb; i++)
        {
            StdDraw.point(chirp[i], temp[i]);
        }

    }

    public static double mean(double[] chirp)
    {
        double sum = 0;
        for (int i = 0; i < chirp.length; i++)
        {
            sum += chirp[i];
            
        }
        
        return sum / chirp.length;
    }

    public static double meanagain(double[] temp)
    {
        double sum = 0;
        for (int i = 0; i < temp.length; i++)
        {
            sum += temp[i];
            
        }
        
        return sum / temp.length;
    }

    public static void stdDeviation (double [] chirp)
    {
        double sum = 0;

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

            double currentElement = chirp[i];
            sum = sum + (currentElement - mean(chirp) )*Math.exp(2);
        }
        System.out.println(sum/chirp.length);
    }

    public static void Deviation (double [] temp)
    {
        double sum = 0;

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

            double currentElement = temp[i];
            sum = sum + (currentElement - meanagain(temp))*Math.exp(2);
        }
        System.out.println(sum/temp.length);
    }

    public static void drawLine(double a, double b) {

        double xMin = 0;
        double yMin = b;
        double xMax = -b/a;
        double yMax = 0;
        StdDraw.line(xMin, yMin, xMax, yMax);
    }

    public static void drawLine(double a, double b, double xMin, double xMax) {

        double y1 = xMin * a + b ;
            double y2 = xMax * a + b;
            StdDraw.line(xMin, y1, xMax, y2);
    }

}