Question

This program is to be written in Java Language. Thank you

A College has conducted a student survey. Students were asked to rate their satisfaction with remote learning courses. Students rated their satisfaction on a scale of 1 to 5 (1 = "I hate it", 5 = "I love it"). The student responses have been recorded in a file called "StudentResponses.txt". Each line of the file contains one student response.

Program 1 You are to write a program that reads and analyzes the survey responses. Your program should read the contents of the file and place the responses into an ArrayList. Your program should write a report to a file. The file should contain the number of students who responded to the survey, along with the mean, median, and standard deviation of the responses.

Program 2 Read the file "StudentResponses.txt" and count the number of occurances of the integers from 1 to 5. Use these counters to calculate the mean, median, and standard deviation.

Your program should use functions to calculate the mean, median and standard deviation. Each function should have an ArrayList as a parameter, and should return a double. Each function including the main should have a clearly stated algorithm.

Answer 1

Short Summary:

Implemented the program as per requirement

Attached source code and sample output

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Source Code:

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

//This class reads a file and calculates mean,median and standard deviation

public class StudentsSurvey {

   //Main function
   public static void main(String[] args) {

       //Declare array of size as per requirement
       int[] initialArray=new int[200];
       try {
           //Read file using scanner
           Scanner sc=new Scanner(new File("C:\\Users\\asus\\StudentResponses.txt"));
           int i=0;

           while(sc.hasNext())
           {
               initialArray[i]=sc.nextInt();
               i++;
           }
           int arrayLength=i;
           //Create an array with number of elements size
           int[] array=new int[arrayLength];
           for(int j=0;j<arrayLength;j++)
               array[j]=initialArray[j];
           sc.close();
           //Write to a file
           FileWriter obj=new FileWriter(new File("C:\\Users\\asus\\StudentResponseStatistics.txt"));

           obj.write("No Of students responded to the survey:"+arrayLength+"\n");
           System.out.println("No Of students responded to the survey:"+arrayLength);
           //Mean
           obj.write("Mean:"+String.valueOf(mean(array))+"\n");
           //Median
           obj.write("Median:"+String.valueOf(median(array))+"\n");
           //Standard Deviation
           obj.write("Standard Deviation:"+String.valueOf(standardDeviation(array))+"\n");
           obj.flush();
           obj.close();
       } catch (FileNotFoundException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

   }
   //This method calculates mean of given array
   private static double mean(int[] array)
   {
       double mean;
       int sum, i;
       int n = array.length;
       sum = 0;
       //Calculate sum
       for(i = 0; i < n; i++) {
           sum+=array[i];
       }
       mean=(double)sum/n;

       return mean;

   }
   //This method calculates median of given array
   private static double median(int[] array)
   {
       int n = array.length;

       // sort the array
       Arrays.sort(array);
       if (n % 2 != 0)
           return (double)array[n / 2]; // even case

       return (double)(array[(n - 1) / 2] + array[n / 2]) / 2.0;
   }
   //This method calculates standardDeviation of given array
   private static double standardDeviation(int[] array)
   {
       double sum = 0.0, standardDeviation = 0.0;
       int n = array.length;

       //Calculate sum
       for(double num : array) {
           sum += num;
       }

       double mean = sum/n;

       for(double num: array) {
           standardDeviation += Math.pow(num - mean, 2);
       }

       return Math.sqrt(standardDeviation/n);

   }

}

Code Screenshot:

Output:

IP File:

OP File:

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