The Normal Distribution Flashcards

1
Q

In any normal distribution…

A

the mean, median and mode coincide

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2
Q

What is the z-score

A

the number of standard deviations that x lies above/below (if z is -ve) the mean

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3
Q

What does the PDF of Z look like

A

a bell shaped curve

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4
Q

Y-intercept of the standard normal distribution

A

1/square root of 2 pi = 0.4

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5
Q

The cumulative distribution function tables are all valid for

A

P(Z

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6
Q

To find a probability >

A

1-P(Z

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7
Q

What is the empirical rule

A
  • 1 –> 1 = 68%
  • 2 –> 2 = 95%
  • 3 –> 3 = 99.7%
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