allows for data to be seen more clearly and is used for discrete data which describes data that has been divided into categories
the bars do not touch each other showing we are dealing with separate conditions
histograms
the bars do touch each other which shows we are dealing with continuous data rather than discrete
line graphs
represents continuous data whereby points are connected by lines to show the change of values
scattergrams
used to show associations between co-variables rather than differences
normal distributions
is a symmetrical pattern of frequency data that forms a bell-shaped pattern indicating that most scores are close to the mean and progressively fewer scores being located at the extremes of either tail of the distribution
skewed distribution
a spread of frequency that is not symmetrical, instead the data all clusters to one end
positive skew
most of the distribution of data is concentrated on the right
mean is higher than the mode meaning the test was harder
negative skew
most of the data distribution is concentrated on the left
mode is higher than the mean meaning the test was easier
