...Standard Deviation Abstract
QRB/501
Standard Deviation Abstract
Standard Deviations Are Not Perverse
Purpose:
The purpose of this article is to illustrate how using statistical data, such as standard deviation, can help a cattleman choose the best lot of calf’s at auction. The statistical data used in these decision making processes can also help the cattleman with future analysis of the lots purchased and existing stock....

...I'll be honest. Standard deviation is a more difficult concept than the others we've covered. And unless you are writing for a specialized, professional audience, you'll probably never use the words "standard deviation" in a story. But that doesn't mean you should ignore this concept.
The standard deviation is kind of the "mean of the mean," and often can help you find the story behind the data. To understand this concept, it can help to learn...

...Standard Deviation
objective
• Describe standard deviation and
it’s importance in biostatistics.
Measure of Dispersion
• Indicates how widely the scores
are dispersed around the central
point (or mean.)
-Standard deviation
Standard Deviation.
• The most commonly used method
of dispersion in oral hygiene.
• The larger the standard deviation,
the wider the distribution curve.
Standard Deviation
• SD, ,...

...14, 15, 15, 16. The mean is 14.0mm.What is the best estimate of the standard deviation?
-1mm
5 1000 bananas were collected from a single plantation and weighed.Their masses formed a normal distribution. How many bananas would be expected to be within 2 standard deviations of the mean?
-950
6 In a normal distribution, what percentage of values fall within ±1 standard deviation of the mean and ±2 standard deviations of the mean? ...

...Mean and Standard Deviation
The mean, indicated by μ (a lower case Greek mu), is the statistician's jargon for the average value of a signal. It is found just as you would expect: add all of the samples together, and divide by N. It looks like this in mathematical form:
In words, sum the values in the signal, xi, by letting the index, i, run from 0 to N-1. Then finish the calculation by dividing the sum by N. This is identical to the equation: μ =(x0 + x1 + x2 + ... +...

...Standard Deviation in the Business World
QRB/501
Abstract On Standard Deviations in Job Performance
The purpose of this study was to compare the expected payoffs from personnel programs based on standard deviation of job performances in dollars, the Global Estimation model, and the CREPID procedure. The study was done for route salesmen of a large soft drink bottling company. The Global Estimation model and the CREPID procedure were behaviorally...

...Standard deviation can be difficult to interpret as a single number on its own. Basically, a small standard deviation means that the values in a statistical data set are close to the mean of the data set, on average, and a large standard deviation means that the values in the data set are farther away from the mean, on average.
The standard deviation measures how concentrated the data are around the mean; the more concentrated, the...

...
Student Exploration: Sight vs. Sound Reactions
Vocabulary: histogram, mean, normal distribution, range, standard deviation, stimulus
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
Most professional baseball pitchers can throw a fastball over 145 km/h (90 mph). This gives the batter less than half a second to read the pitch, decide whether to swing, and then try to hit the ball. No wonder hitting a baseball is considered one of the hardest things to do...

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