class Study {
  int k;
  float testvalue;
  String tail;

  // Constructor
  Study() {
    testvalue = random(-5, 5);
    k = int(random(3));
    if (k==0) {
      tail = "right-tailed";
    } 
    else if (k==1) {
      tail = "left-tailed";
    }
    else {
      tail = "two-tailed";
    }
  }
}