normal curve Flashcards
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
skewness
few scores fall at the high end of distribution, may indicate that the test was too difficult
positive skew
few scores fall at the low end of distribution, may indicate that the test was too easy
negative skew
steepness of a distribution, measure of combined weighg of a distribution’s tails relative to the rest of the distribution
kurtosis
relatively peaked, greater kurtosis than a mesokurtic, extremely thick tails and very thin and tall peak, “lepto” means skinny
leptokurtic
most similar to a standard normal distribution, resembles a bell curve, fatter tails, considered normally distributed but not the standard
mesokurtic
have slender tails and peak that’s smaller then mesokurtic, platy means broad
platykurtic
normal curve - history, during the 18th century, the work of?
Abraham De Moivre and Marquis de Laplace
19th century made substantial distribution
Karl Friedrich Gauss
19th century referred as ???
Laplace-Gaussian Curve
credited with being the first to refer to the curve as normal curve
Karl Pearson
perfectly symmetrical, with no skewness, mean median mode have the same value
normal curve
square root of the variance
standard deviation
difference between the score or variation
variance