import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class PeppersPillMill {
/**
* In addition to the class that contains your main method, you must
* implement and use the following TrialGroup class in your program.
*
* @param args
*/
public static void main(String[] args) {
   // Your program should ask for the names of 3 files (input files)
   // that contain memory evaluation data for the three groups
   // in this trial.
   Scanner keyboard = new Scanner(System.in);
   String fileName;

   System.out.print("Enter the first input file: ");
   fileName = keyboard.next();
   TrialGroup group1 = new TrialGroup(fileName);

   System.out.print("Enter the sedond input file: ");
   fileName = keyboard.next();
   TrialGroup group2 = new TrialGroup(fileName);

   System.out.print("Enter the third input file: ");
   fileName = keyboard.next();
   TrialGroup group3 = new TrialGroup(fileName);

   // Your program should then ask for a name for the file that will
   // hold the trial results (the output file).
   // All files will be located in the same directory as your program.
   System.out.print("Enter the output file: ");
   fileName = keyboard.next();

   try {
         FileWriter fw = new FileWriter(fileName);

         /**
         * The results file will have two sections. The first section
         * (Statistics) will list the name of each input file, followed by
         * the average and then the standard deviation for that file
         */
         fw.write("Statistics:" + System.lineSeparator());
         fw.write(group1.getFileName() + ": "
               + group1.getAverage() + " "
               + group1.getStandardDeviation()
               + System.lineSeparator());
         fw.write(group2.getFileName() + ": "
               + group2.getAverage() + " "
               + group2.getStandardDeviation()
               + System.lineSeparator());
         fw.write(group3.getFileName() + ": "
               + group3.getAverage() + " "
               + group3.getStandardDeviation()
               + System.lineSeparator());

         /**
         * The second section (Results) will list the names of the two files
         * being compared, and an indication (true or false) of whether or
         * not the result is significant.
         */
         fw.write("Results:" + System.lineSeparator());

         // first pair
         fw.write(group1.getFileName() + " vs. "
               + group2.getFileName() + " : ");
         if (Math.abs(group1.getAverage() - group2.getAverage())
               <= group1.getStandardDeviation()
               || Math.abs(group1.getAverage() - group2.getAverage())
               <= group2.getStandardDeviation()) {
            fw.write("false");
         } else {

1. Write a recursive method to find the greatest common divisor of...