Free Web-Based PDF Editor - Edit PDF Online - PDF Hammer. Solve Equation :: QuickMath.com - Automatic Math Solutions. Unlock your password protected PDF files online for FREE! Statistical Analysis. Home • People • Courses • Program • Research • Clinic • Goals • Kiosk • News Understanding Basic Statistics • Fitting • Exercise • Excel • Igor • Kaleidagraph • Origin • Power Laws • Dimensional Analysis Mean or Average The mean or average of a set of values is the sum of the values divided by the number of the values.
Symbolically, The mean of a number of repeated measurements of an experimental quantity is the best estimate of the true value of the quantity. Standard deviation The standard deviation of a set of values is a measure of the typical distance between the average and any given value. Imagine plotting a histogram of the horizontal distance x traveled by a projectile launched from a (rather shoddy) spring-loaded launcher.
The (sample) standard deviation is defined by where the factor of n-1 (instead of n) in the denominator arises because we usually don't know a priori the mean of the distribution, and use the average of our sample to estimate it. Standard error.
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