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The distribution under the normal curve can be seen a lot in society, although you may...

The distribution under the normal curve can be seen a lot in society, although you may not even notice it. Have you been watching the presidential candidate polls on tv? If you ever see the +- 3 that is beside the percentage given on if they are winning; that is the standard deviation. This is exactly what they are referring to. So really, how accurate are those polls?


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Answer #1

So:

when they are referring to +-3 ,it means according to empircal rule for normal distribution,

About 99.7% of the all values lies fall within 3 standard deviations of the mean.

when you find probbaility

P(mean-3sd<X<mean+3sd)

you will get an area of 0.997

that is

polls are 99.7% accurate

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