Well, were trying to get caught up to where we were in school last year. And we are going over standard deviation. I just have a simple question.(adsbygoogle = window.adsbygoogle || []).push({});

Why, when you are examining only a sample do you (when trying to find the variance) use n-1, and when you are examining the population, you use n?

Let's see if I can't get this in latex...:

[tex]\sqrt{\frac{1}{n-1}\sum_{i=1}^n ({x_i}-{\bar{x}})^2}[/tex]intead of [tex]\sqrt{\frac{1}{n}\sum_{i=1}^n ({x_i}-{\bar{x}})^2[/tex]

Sorry if this question insults your intelligence. I just can't see the reason.

Paden Roder

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Just a statistics question

Loading...

Similar Threads - statistics question | Date |
---|---|

Fun maths question, correlation? | Feb 27, 2015 |

Question in regards to class (statistic) | Jan 30, 2014 |

Basic statistics calibration question | Jul 31, 2013 |

Easy statistics question | Feb 17, 2011 |

Standard Statistics Question | Mar 17, 2010 |

**Physics Forums - The Fusion of Science and Community**