void response() {
  switch(page) {
  case 1:
    answers[0] = "Case " + (cb1.selectedIndex()+1);
    if (aStudy.known == 1) {
      answers[0] += ", and the correct answer is Case 1.";
      if (cb1.selectedIndex()==0) {
        feedback = "Correct!";
        score += 10;
      }
      else {
        feedback = "Incorrect. The correct answer is Case 1 - Known Variances.";
      }
    } 
    else if (aStudy.samplesize > 30) {
      answers[0] += ", and the correct answer is Case 2.";
      if (cb1.selectedIndex()==1) {
        feedback = "Correct!";
        score += 10;
      }
      else {
        feedback = "Incorrect. The correct answer is Case 2 - Unknown Variances, n large.";
      }
    } 
    else {
      answers[0] += ", and the correct answer is Case 3.";   
      if (cb1.selectedIndex()==2) {
        feedback = "Correct!";
        score += 10;
      }
      else {
        feedback = "Incorrect. The correct answer is Case 3 - Unknown Variances, n small.";
      }
    }
    break;

  case 3:
    answers[2] = tf3.getText() + ", and the correct answer is " + nf(aStudy.muo, 1, 2)+".";
    if (abs(Float.parseFloat(tf3.getText())-aStudy.muo)<0.01) {
      feedback = "Correct!";
      score += 10;
    }
    else {
      feedback = "Incorrect. The correct answer is " + nf(aStudy.muo, 1, 2)+".";
    }
    break;

  case 4:
    if (cb4.selectedIndex()==0) {
      answers[3] = "Z formula 1";
    }
    else if (cb4.selectedIndex()==1) {
      answers[3] = "Z formula 2";
    }
    else {
      answers[3] = "t formula";
    }

    if (aStudy.known == 1) {
      answers[3] += ", and the correct answer is Z formula 1.";
      if (cb4.selectedIndex()==0) {
        feedback = "Correct.";
        score += 10;
      }
      else {
        feedback = "Incorrect. It should be Z formula 1 since this is Case 1 - Known Variances.";
      }
    }
    else if (aStudy.samplesize > 30) {
      answers[3] += ", and the correct answer is Z formula 2.";
      if (cb4.selectedIndex()==1) {
        feedback = "Correct.";
        score += 10;
      }
      else {
        feedback = "Incorrect. It should be Z formula 2 since this is Case 2 - Unknown Variances, n large.";
      }
    }
    else {
      answers[3] += ", and the correct answer is t formula.";
      if (cb4.selectedIndex()==2) {
        feedback = "Correct.";
        score += 10;
      }
      else {
        feedback = "Incorrect. It should be t formula since this is Case 3 - Unknown Variances, n small.";
      }
    }
    break;

  case 5:
    answers[4] = tf3.getText() + ", and the correct answer is " + nf(testvalue, 1, 4)+".";
    if (abs(Float.parseFloat(tf3.getText())-testvalue)<0.001) {
      feedback = "Correct!";
      score += 10;
    }
    else {
      feedback = "Incorrect. The correct answer is " + nf(testvalue, 1, 4)+".";
    }
    break;

  case 6:
    answers[5] = tf3.getText();
    if ((aStudy.known == 1) || (aStudy.samplesize>30)) {
      answers[5] += ", and the correct answer is " + nf(zvalue, 1, 4)+".";
      if (abs(Float.parseFloat(tf3.getText())-zvalue)<0.001) {
        feedback = "Correct!";
        score += 10;
      }
      else {
        feedback = "Incorrect. The correct answer is " + nf(zvalue, 1, 4)+".";
      }
    }
    else {
      answers[5] += ", and the correct answer is " + nf(tcomp, 1, 4)+".";
      if (abs(Float.parseFloat(tf3.getText())-tcomp)<0.001) {
        feedback = "Correct. 5% of the area will be to the right of " + nf(tcomp, 1, 4)+".";
        score += 10;
      }
      else {
        feedback = "Incorrect. The correct answer is " + nf(tcomp, 1, 4) + ". 5% of the area will be to the right of this number.";
      }
    }
    break;

  case 7:
    if ((aStudy.known == 1) || (aStudy.samplesize>30)) {
      answers[6] = tf3.getText() + ", and the correct answer is " + nf(p, 1, 4)+".";
      if (abs(Float.parseFloat(tf3.getText())-p)<0.01) {
        feedback = "Correct!";
        score += 10;
      }
      else {
        feedback = "Incorrect. The correct answer is " + nf(p, 1, 4)+".";
      }
    }
    else {
      if (cb6.selectedIndex()==0) {
        answers[6] = "more than 5%";
      }
      else {
        answers[6] = "less than 5%";
      }

      if (p>.05) {
        answers[6] += ", and the correct answer is more than 5%.";
        if (cb6.selectedIndex()==0) {
          feedback = "Correct!";
          score += 10;
        }
        else {
          feedback = "Incorrect. The correct answer is more than 5%.";
        }
      }
      else {
        answers[6] += ", and the correct answer is less than 5%.";
        if (cb6.selectedIndex()==1) {
          feedback = "Correct!";
          score += 10;
        }
        else {
          feedback = "Incorrect. The correct answer is less than 5%.";
        }
      }
    }
    break;

  case 8:
    if (p<.05) {
      if (cb7.selectedIndex()==0) {
        answers[7] = "Reject Ho, and the correct answer is reject Ho.";
        feedback = "Correct";
        score += 10;
      }
      else {
        answers[7] = "Can not reject Ho, and the correct answer is reject Ho.";
        feedback = "Incorrect. The correct answer is reject Ho.";
      }
    }
    else {
      if (cb7.selectedIndex()==1) {
        answers[7] = "Can not reject Ho, and the correct answer is can not reject Ho.";
        feedback = "Correct";
        score += 10;
      }
      else {
        answers[7] = "Reject Ho, and the correct answer is can not reject Ho.";
        feedback = "Incorrect. The correct answer is can not reject Ho.";
      }
    }
    break;
  }

  answered[page-1]=true;
}