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Year 8 Data

Definitions and Facts from the NSW Year 8 DataTopic

bias something unwanted that causes a sample to not truly represent the population
categorical data non-numerical data that can be classified into categories (e.g people’s eye colour, or their favourite rugby team)
data a collection of facts or raw information
dot plot a special column graph of dots for a small set of numerical data
frequency how often a score appears in a data set
frequency histogram a special column graph that shows the frequencies of numerical data
frequency polygon a special line graph that shows the frequencies of numerical data
quantitative data numerical data that can be measured or counted (e.g peoples height or the number of pets they own)
Stem-and-leaf plot a ‘sideways column graph that lists the numerical data in order
analyse to examine something carefully by breaking it down into its parts or features
data set a collection of data or scores about the same subject
mean the average value of a data set, found by dividing the sum of scores by the number of scores
measure of location a general name for the average, middle or typical value of a data set (e.g the mean, median or mode)
median the middle score of a data set when the scores are arranged in order
mode the most common score or scores of a data set
range the difference between the highest score and lowest score in a data set
scatter diagram a diagram of dots on a number plane that illustrates a relationship between the variables
Created by: wdobson