Using jquery attr to Check/Uncheck checkbox-cpming

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Using jquery attr to Check/Uncheck checkbox</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
</head>
<body>
<div>
   <label for="checkbox">
   <input type="checkbox" name="money" id="checkbox">
   Option
   </label>
</div>
<button id="chk-btn">Check</button>
<button id="cancel-btn">UnCheck</button>
<script>
$(function (){
   $("#chk-btn").click(function (){
   $("#checkbox").attr("checked", true);
   });
   $("#cancel-btn").click(function (){
   $("#checkbox").attr("checked", false);
   });
});
</script>
</body>
</html>