STAT 1000 Review

A ________ variable places a case into one of several groups or categories.

A summarized value of a sample

A summarized value of a population

The ______ is sensitive to the influence of extreme observations. We
say that it is not a resistant measure of the center.

When there is an odd number of observations, ______ ___ the overall
median when you locate the quartiles in the ordered list.

The ______ ___________ ___________ of a distribution consists of the smallest
observation, the first quartile, the median, the third quartile, and
the largest observation, written in order from smallest to largest.

standard deviation equals 0 only when there is no variability. This happens only when all
observations have the same value. Otherwise, standard deviation is always _______ than 0.

Adding 3 to each observation:
▶ It adds ___ to measures of center (mean and median)
▶ It adds ___ to quartiles and other percentiles
▶ It does not change the measure of spread (interquartile range
and standard deviation)

A density curve is a curve that:
▶ Is always on or above the horizontal axis.
▶ Has area exactly equal to ___ underneath it.

All Normal curves are:
▶ ___________
▶ unimodal (single-peaked)
▶ bell-shaped