Unit 4 Stats Formulas & Conditions

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10 Terms

1
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10% condition

n < (.10)N

2
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What does the 10% condition prove?

We can use a binomial distribution even though it is not independent.

3
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Large Counts Condition

np > 10 & n(1-p)>10

4
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What does the large counts condition prove?

That we can use a normal distribution to model a binomial distribution.

5
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Calculate the mean of a binomial

np

6
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Calculate the standard deviation of a binomial

Square root of np(1-p)

7
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Calculate the mean of X + Y

Mx+My

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Calculate the mean of X-Y

Mx-My

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Calculate the standard deviation of X+Y

Square root of X²+Y²

10
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Calculate the standard deviation of X-Y

Square root of X²+Y²