Review of Quiz

Looking for a critique on my quiz. Specifically confused about the toLowerCase() and toUpperCase() and if I use a == instead of === for my answers.

//quiz begins, no answers correct var score = 0;

//alert box telling user quiz will begin alert('Welcome to the Conditional Quiz Challenge. Click OK to begin.');

/* Start the quiz Quesetions 1-5 */ var answer1 = prompt('what language am i studying right now?'); if (answer1.toLowerCase() === "javascript") { score +=1; } else { alert('Thats wrong. On to the next question. Click OK to continue'); }

var answer2 = prompt('where do I work?');
    if (answer2.toUpperCase() === "VITALS") {
        score +=1;
    }
    else {
    alert('Thats wrong. On to the next question. Click OK to continue');
}

var answer3 = prompt('Where was I born?');
    if (answer3.toLowerCase() == "paterson") {
    score +=1;
}
else {
    alert('Thats wrong. On to the next question. Click OK to continue');
}

var answer4 = prompt('what type of phone do I have?');
    if (answer4.toLowerCase() === "samsung galaxy s4 mini") {
        score +=1;
    }
    else {
    alert('Thats wrong. On to the next question. Click OK to continue');
}

// Let the user know they are approaching the last question alert('Last Question. Click OK to begin');

var answer5 = prompt('Who is the Greatest Of All Time?');
    if (answer5.toUpperCase() === "MUHAMMAD ALI") {
        score +=1;
    }
    else {
        alert('Thats wrong. Lets find out your score. Click OK to continue');
    }

// Let the user know how many questions they answered correctly document.write('you answered ' + score + ' out of a possible 5 questions');

//score counter if ( score === 5) { document.write('<p></p><p>You earned a gold medal.</p>'); } else if ( score >=3 ) { document.write('<p></p><p>You earned a silver medal.</p>'); } else if ( score >=1 ) { document.write('<p></p><p>You earned a bronze medal.</p>'); } else { document.write('<p></p><p>You got no questions correct and therefore have not earned a medal. Refresh the page to try again.</p>'); }