This preview shows page 1. Sign up to view the full content.
Unformatted text preview: measure metabolic rates in calories, both the mean and the standard deviation s are also in calories. This is one reason to prefer s to the variance s2, which is in squared calories. * Like the mean, s is not resistant. A few outliers can make s very large. The fivenumber summary is usually better than the mean and standard deviation for describing a skewed distribution or a distribution with strong outliers. Use and s only for reasonably symmetric distributions that are free of outliers. A graph gives the best overall picture of a distribution. Numerical measures of center and spread report specific facts about a distribution, but they do not describe its entire shape. Numerical summaries do not disclose the presence of multiple peaks or clusters. This symbol for population standard deviation is (o ? ? ? ? ? ) which is pronounced "sigma". "s" is the symbol for sample standard deviation....
View
Full
Document
This note was uploaded on 02/27/2012 for the course STAT 121 taught by Professor Patticolling during the Winter '11 term at BYU.
 Winter '11
 PattiColling
 Standard Deviation

Click to edit the document details