title: R-project Graphic plot
body: <p>I'm trying to plot from the data <a href="http://socserv.socsci.mcmaster.ca/jfox/Books/Applied-Regression-3E/datasets/Vocabulary.txt" rel="nofollow noreferrer">Vocabulary.txt</a> education in relation to vocabulary.</p>
  
  <p>This is the code I used</p>
  
  <pre><code>plot(jitter(education)~jitter(vocabulary),pch=23,xlim=c(0,30),ylim=c(0,30))
  </code></pre>
  
  <p>my graphic looks like this <img src="https://i.stack.imgur.com/S0lz9.jpg" alt="enter image description here"></p>
  
  <p>It doesn't look right maybe someone can explain to me what I did wrong and further on what exactly the command <code>jitter</code> does?</p>