void page3() {
  String t = "Step 3 - The Test Statistics";
  textFont(myboldfont, 18);
  text(t, 30, 170);
  textFont(myfont, 18);

  testl = (aStudy.y - aStudy.n * aStudy.p + 0.5)/sqrt(aStudy.n * aStudy.p * (1-aStudy.p));
  testu = (aStudy.y - aStudy.n * aStudy.p - 0.5)/sqrt(aStudy.n * aStudy.p * (1-aStudy.p));

  if (aStudy.k==0) {
    t = "Since the alternative is left-tailed, we calculate: ";
    text(t, 30, 200);
    image(zl, 70, 220);

    t = "Z_l = ";
    text(t, 130, 345);

    tf2.setXY(200,330);
    tf3.setVisible(false);
  }
  else if (aStudy.k==1) {
    t = "Since the alternative is right-tailed, we calculate: ";
    text(t, 30, 200);
    image(zu, 70, 220);

    t = "Z_u = ";
    text(t, 130, 345);

    tf2.setXY(200,330);
    tf3.setVisible(false);
  }
  else {
    t = "Since the alternative is two-tailed, we calculate: ";
    text(t, 30, 200);
    image(zl, 70, 220);
    image(zu, 300, 220);

    t = "Z_l = ";
    text(t, 130, 345);
    t = "Z_u = ";
    text(t, 400, 345);

    tf2.setXY(200,330);
    tf3.setVisible(true);
  }

  t = "Plug in: Y = " + aStudy.y + ", n = " + aStudy.n + ", and p zero = " + nf(aStudy.p, 1, 2) 
    + ". Calculate the value of Z with at least 3 decimal places. Type in the following textbox(s) then click Answer:";
  drawStrings(t, 30, 290, 25);

  fill(0, 0, 255);
  drawStrings(feedback, 80, 380,25);
}