Skew, Probability & Linear Coding

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Statistics

A-Level Statistics

Edexcel

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9 Terms

1
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Formula for positive skew

mode<median<mean

2
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Formula for no skew

mode=median=mean

3
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Formula for negative skew

mode>median>mean

4
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How is the mean affected by linear coding?

Adding: old mean + x

Multiplying: old mean * x

5
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How is the standard deviation affected by linear coding?

Adding: sd is unchanged

Multiplying: old sd * x

6
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What is the addition rule?

Tests for ME events

P (A or B) = P(A) + P(B) - P(A and B)

7
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What is the test for independence?

P(A and B) = P(A) * P(B)

8
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What is the formula for conditional probability?

P(A given B) = P(A and B)/P(B)

9
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What is the formula for V(X) in a rectangular distribution?

1/12 * (b-a)²