df

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://cdn.jsdelivr.net/gh/vaclab/d3-tip/d3-tip.js"></script>
  <link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet">

<body>
  <script>
    var margin = { top: 70, right: 60, bottom: 110, left: 140 };
		var width = 720 - margin.right - margin.left;
    var height = 500 - margin.top - margin.bottom;
    
    var svg = d3.select("body").append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
    	.attr('shape-rendering', 'crisp-edges')
    	.append('g')
    		.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');

svg.append('g')
    	.attr('transform', 'translate(0, ' + height + ')')
    	.call(xaxis)
    	.selectAll('text')
    	.attr('transform', 'rotate(-45)')
    	.attr('text-anchor', 'end')
    	.style('font-size', '12px')
    
    svg.append('g')
    	.call(yaxis)
    	.selectAll('text')
    	.style('font-size', '12px');
   
    svg.append('text')
    	.text("Percent of participants who have a detectable level")
    	.attr('text-anchor', 'middle')
    	.attr('transform', 'translate(-50, ' + (height/2) + ') rotate(-90) ');
    
    svg.append('text')
    	.text("How often did we find each chemical in our participants?")
    	.style('font-size', '14pt')
    	.style('font-weight', 'bold')
    	.attr('transform', 'translate(0, -30)')
    
    svg.call(tip);
    
    svg.selectAll('.bar')
    	.data(data)
    	.enter()
    	.append('rect')
    	.attr('class', 'bar')
    	.attr('width', x.bandwidth())
    	.attr('height', function(d) { return height - y(d.y / 100); })
    	.attr('transform', function(d) {
      	return "translate(" + x(d.x) + "," + (y(d.y / 100)) + ")";
    	})
    	.style('fill', 'rgb(89,145,190)')
    	.on('mouseover', tip.show)
    	.on('mouseout', tip.hide)
  </script>
</body>

Updated missing url https://cdn.rawgit.com/VACLab/d3-tip/master/d3-tip.js to https://cdn.jsdelivr.net/gh/vaclab/d3-tip/d3-tip.js

https://d3js.org/d3.v4.min.js

https://cdn.rawgit.com/VACLab/d3-tip/master/d3-tip.js