types of data

quantative

associated w numerical observations (e.g. height, shoe size)

qualitative

associated w non-numerical observations (e.g. hair colour)

continuous

can take any value in a given range (e.g. height/ time)

discrete

only specific values in a given range (e.g. shoe size)

classes

groups in a freq table

class boundaries

max and min values in each class

midpoint

average of class boundaries

class width

diff between upper and lower class boundaries