Difference between revisions of "DesStats Exercises"

From ECLR
Jump to: navigation, search
 
Line 47: Line 47:
 
</li>
 
</li>
 
<li><p>You realise that you forgot to take account of an 11th observation that should be added to the above dataset. Your assistance adds the 11th observation and reports a new sample average of 49. What is the value of the observation that has been added? <math>\{39\}</math></p></li></ol>
 
<li><p>You realise that you forgot to take account of an 11th observation that should be added to the above dataset. Your assistance adds the 11th observation and reports a new sample average of 49. What is the value of the observation that has been added? <math>\{39\}</math></p></li></ol>
 
= Footnotes =
 

Latest revision as of 10:37, 27 August 2014



Exercises

Solutions in curly {curly brackets}. Worked solution clips can be found here Q1 and Q2.

    1. You have the following dataset:

      Data [math]1[/math] [math]2[/math] [math]3[/math] [math]4[/math] [math]5[/math] [math]6[/math] [math]7[/math] [math]8[/math] [math]9[/math] [math]10[/math]
      [math]x_i[/math] [math]52[/math] [math]48[/math] [math]36[/math] [math]62[/math] [math]51[/math] [math]51[/math] [math]48[/math] [math]64[/math] [math]39[/math] [math]49[/math]
      1. Calculate the sample mean and the sample standard deviation of [math]x_i[/math]. [math]\{50,8.6410\}[/math]

      2. Calculate the population standard deviation and variance of [math]x_i[/math]. [math]\{8.1976,67.2\}[/math]

      3. What is the Median of [math]x_i[/math].[math] \{50\}[/math]

    2. You realise that you forgot to take account of an 11th observation that should be added to the above dataset. Your assistance adds the 11th observation and reports a new sample average of 49. What is the value of the observation that has been added? [math]\{39\}[/math]