Numerical Descriptive Measures

is the extent to which all the data values group around a typical or central value

is the amount of dispersion of scattering of values

is the pattern of the distribution of values from the lowest value to the highest value.

is the most common measure of central tendency

X̄

n

Xi

sum of values divided by the number of values

Mean is affected by extreme values (outliers)

• True

• False

is the “middle” number (50% above, 50% below)

• mean

• median

• mode