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*Standard*** Deviation**
objective
• Describe

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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 "

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** Deviation**
Definition:
Behavior commonly seen in children that is the result of some obstacle to normal development such behavior may be commonly understand as negative (a timid child, a destructive child) or positive (a quite child), both positive and negative

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selected.
c) reasonably large due to the “cluster” effect.
d) 100 divided by the size of the population of Laramie.
Costs for ** standard** veterinary services at a local animal hospital follow a Normal distribution with a mean of $80 and a

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*STANDARD*** DEVIATION**
The

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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 + ... + xN-1)/N. If you are not...

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milligrams of tar per cigarette and a *standard*** deviation** equal to 1.0 milligram. Suppose a sample of 100 low-tar cigarettes is randomly selected from a day’s production and the tar content is measured in each. Assuming that the tobacco company’s claim is true, what is the probability that the mean tar content of the sample is greater than 4.15 milligrams?
[0.00621]
2. The safety limit of a crane is known to be 32 tons. The mean weight and the

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the actuarial field and finds the average salary to be $41,000. The population *standard*** deviation** is $3000. Can her claim be supported at 0.05?
x¯=14.7, μx¯=13.77, ox¯=5.34, n=29, α=.01
3. Monthly Home Rent. The average monthly rent for a one bedroom in San Francisco is $ 1229. A random sample of 15 one bedroom homes about 15 miles outside of San Francisco had a mean rent of $1350. The population

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are risk averse and have the following three choices. Which project will you select? Compute the coefficient of variation for each.
| |Expected |** Standard** |
| |Value |

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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 in sports!
1....

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