Lecture 5 Flashcards
data that has not been
placed in any group or category after
collection
UNGROUPED DATA
data classified into groups after collection
GROUPED DATA
sum of the data values divided by the number of
data values
MEAN
divides the distribution into two equal parts.
MEDIAN
sometimes called nominal average
MODE
statistics that describe
various subdivisions of a frequency
distribution into equal proportions
QUANTILES
split
the ordered data
into four quarters
QUARTILES
split the
ordered data into
ten equal.
DECILES
split
the ordered data
into 100 equal
parts.
PERCENTILES
the difference between the largest and the smallest
observations or items in a set of data
RANGE
A measure where the bulk of the values lie
INTERQUARTILE RANGE
It is a measure of how far away items in a data set are from
the mean.
STANDARD DEVIATION
It represents all data points in a set
VARIANCE
the degree of distortion from the
symmetrical bell curve or the normal distribution
SKEWNESS
Negatively Skewed/Skewed Left
SKEWNESS < 0
Mean < Median < Mode
Positively Skewed/Skewed Right
SKEWNESS > 0
Mode < Median < Mean
It is actually the measure of outliers present in the
distribution.
KURTOSIS
This distribution has
kurtosis statistic similar to that of the normal
distribution
MESOKURTIC
Peak is higher and
sharper than normal distribution, which means that
data are heavy-tailed or profusion of outliers
LEPTOKURTIC
Kurtosis > 3
its tails are shorter
and thinner, and often its central
peak is lower and broader
PLATYKURTIC
Kurtosis < 3
