title: Sampling distribution of the sample mean
body: <p>I have a simple question, although I cant find an answer anywhere. 
  I have the following dataset:</p>
  
  <pre><code>data.set &lt;- c(7,7,8,8,7,8,9)
  </code></pre>
  
  <p>The question from the Basic Stats book is: 
  What is the sampling distribution of the sample mean for samples of size 2?
  Is there a possibility to calculate this in R commander (or using command line). </p>