normal curve Flashcards

1
Q

deviates from the symmetrical or so-called normal distribution, measure of the asymmetry of the probability distribution of real-valued random variable about its mean

A

skewness

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2
Q

few scores fall at the high end of distribution, may indicate that the test was too difficult

A

positive skew

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3
Q

few scores fall at the low end of distribution, may indicate that the test was too easy

A

negative skew

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4
Q

steepness of a distribution, measure of combined weighg of a distribution’s tails relative to the rest of the distribution

A

kurtosis

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5
Q

relatively peaked, greater kurtosis than a mesokurtic, extremely thick tails and very thin and tall peak, “lepto” means skinny

A

leptokurtic

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6
Q

most similar to a standard normal distribution, resembles a bell curve, fatter tails, considered normally distributed but not the standard

A

mesokurtic

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7
Q

have slender tails and peak that’s smaller then mesokurtic, platy means broad

A

platykurtic

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8
Q

normal curve - history, during the 18th century, the work of?

A

Abraham De Moivre and Marquis de Laplace

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9
Q

19th century made substantial distribution

A

Karl Friedrich Gauss

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10
Q

19th century referred as ???

A

Laplace-Gaussian Curve

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11
Q

credited with being the first to refer to the curve as normal curve

A

Karl Pearson

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12
Q

perfectly symmetrical, with no skewness, mean median mode have the same value

A

normal curve

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13
Q

square root of the variance

A

standard deviation

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14
Q

difference between the score or variation

A

variance

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