Posting my solution for a review :)

correct > 2 && correct < 5

/*
    The Ultimate Quiz Challenge
*/

var correct = 0;
var input = '';
var message = '';

// Question 1
input = prompt('There are 24 hours in a day', 'true or false');
if (input === 'true' || input.toLowerCase() === 'yes') {
  correct += 1;
}

// Question 2
input = prompt('How many quarters make $1.00?');
if (input === '4' || input.toLowerCase() === 'four') {
  correct += 1;
}

// Question 3
input = prompt('Which family does a trumpet belong to?', 'woodwinds, brass, percussion, or strings');
if (input.toLowerCase() === 'brass') {
  correct += 1;
}

// Question 4
input = prompt('Which language is this that you are learning right now?');
if (input.toLowerCase() === 'javascript') {
 correct += 1; 
}

// Question 5
input = prompt('How many fingers are on a human hand?');
if (parseInt(input) === 5 || input.toLowerCase() === 'five') {
  correct += 1;
}

/* Rank the player based on questions answered
    Gold Crown: All correct
    Silver Crown: 3-4 correct
    Bronze Crown: 1-2 correct
    No Crown: 0 correct
*/

if (correct === 5) {
  message = "Congratulations!! ALL questions were correct, you earned the GOLD CROWN!!";
} else if (correct >= 3) {
  message = "Way to Go! You answered " + correct + " questions correctly and earned the SILVER CROWN!";
} else if (correct >= 1) {
  message = "Not too bad. You answered " + correct + " questions correctly and earned the Bronze Crown.";
} else {
  message = "You did not answer any questions correctly, and therefore did not earn a crown. Sorry, try again!";
}

// Final message letting user know how many were correct
document.write("<p>" + message + "</p>");