CH 3 - Displaying data

Frequency distribution

Graphical representation of the number of individuals in each category on the scale of measurement.

Real lower limit

lower bounds for an interval

(I.E a score equal to or greater than 1.895000 and less than 1.995000 would fall in the 1.90–1.99 interval)

real upper limit

upper bounds for an interval

(I.E a score equal to or greater than 1.895000 and less than 1.995000 would fall in the 1.90–1.99 interval)

midpoint

Center of an interval

Stem and leaf display

technique used to classify either discrete or continuous variables. Used to organize data as they are collected

Histogram

diagram consisting of rectangles whose area is proportional to the frequency of a variable. Used to represent quantitative data

leading digits

Sometimes called the most significant digits, refers to digits at the beginning of a number

(I.E number 5200, the leading digit is 5, and the trailing digits are the two 0s)

Trailing digits

Also known a the less significant digits. the digits at the end of a number

(I.E number 5200, the leading digit is 5, and the trailing digits are the two 0s

Binomial distribution

Distribution that has two ‘peaks’ that can be uneven

Negatively skewed

type of distribution in which more values are concentrated on the right side (tail) of the distribution graphtype of distribution in which most values are clustered around the left tail of the distribution

Positive skew

type of distribution in which most values are clustered around the left tail of the distribution

Uniform distribution

Distribution graph that has no peaks. probability of getting any value is the same

Outliers

A value that lies an abnormal distance from other values in a random sample from a population.