The normal curve Flashcards

1
Q

Explain all the important parts of a normal curve

A

-Symmetrical bell shaped
- Used with continuous variables
-Peaks above a midway point
-mean, median, and mode are the same for the normal curve

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2
Q

In the normal curve, the standardized z-score has a mean of and a standard deviation of

A

A mean of zero
A standard deviation score of 1.

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3
Q

Every normal curve can be interpreted in exactly the same way once any distance from the mean is expressed in

A

standard deviation units

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4
Q

68% of the area under the normal curve is within one standard deviation above and below the mean
5% of the area under the normal curve is more than two standard deviations above and below the mean

A

Every normal curve can be interpreted in exactly the same way once any distance from the mean is expressed in standard deviation units

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5
Q

A unit free, standardized score

Indicates how many standard deviations a score is above or below the mean of a distribution

A

Z-scores

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6
Q

z = X - µ/
ơ

A

z- score calculation

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7
Q

the original score

A

X

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8
Q

mean for the normal distribution of the original scores

A

µ

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9
Q

standard deviation for the normal distribution of the original scores

A

ơ

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10
Q

Units of measurement cancel each other out – thus,

A

a unit free, standardized number

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11
Q

Z scores consist of two parts

A
  1. A positive or negative sign: Indicates whether the number is below or above the mean
  2. A number: Indicates the size of its deviation from the mean in standard deviation units
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12
Q
  1. A positive or negative sign: Indicates whether the number is below or above the mean
  2. A number: Indicates the size of its deviation from the mean in standard deviation units
A

z-scores

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