Health Sciences 3801A/B Chapter Notes - Chapter 2.7: Standard Deviation, Standard Error

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 3801A/B
• Professor: Andrew Johnson

Document Summary

Section 2. 7 - measures of the spread of data. Deviation the difference b/w x and the mean if x is a number. Sampling variability of a statistic how much the statistic varies from one sample to another. Standard deviation a number that measures how far data values are from their mean. Variance the average of the squares of the deviations. Standard deviation is the most common measure of variation in a data set. Provides a numerical measure of the variation in a data set overall. Can be used to determine if a particular data value is far from or close to the mean. The standard deviation provides a measure of the overall variation in a data set. It is always positive or 0, and is small when data values are closer to the mean, and larger when the data values are further away from the mean.