Data Analysis & Statistics - 7th Grade Math

data

collection of facts, such as numbers, words, measurements, observations or even just descriptions of things.

interquartile range

the difference between the upper and lower quartiles in a box and whisker plot

mean

the sum of the items in a set of data divided by the number of items in the set (also known as an average)

measure of center or central tendency

a measure used to describe the middle of a data set such as mean, median, and mode

measure of spread

this measure describes the variability of a data set - it can include range, quartiles, and percentiles

median

the middle number or the average of the middle 2 numbers in an ordered set of data

mode

the numbers or numbers that occur MOST frequently in a data set

survey

a data collection tool or list of questions used to gather information about individuals or group

bar graph

using vertical or horizontal bars to display data

box plot

a graph that shows how data are distributed by using the median, quartiles, least and greatest value; also called a box-and-whisker plot

circle graph

a graph that uses sectors of a circle to compare parts to a whole or parts to parts

dot plot

a graphical display of data using dots

range

the difference between the highest and the lowest value

population

the entire group of objects or individuals considered for a survey

inferences

a conclusion reached on the basis of evidence and reasoning

skewed

When data has a "long tail" on one side or the other

skewed right or positive skew

tail is on the right

skewed left or negative skew

tail is on the left

symmetrical

Well proportioned; balanced; the same on both sides

Quartile 1 (Q1)

the median of the lower half of the data; the lower quartile

Quartile 3 (Q3)

the median of the upper half of the data; the upper quartile