graphical representations

Question 1

Drawing a graph (6m)

Answer 1

• correctly identify which graph you should draw
• plot the correct data
• give the graph a title
• label the axis appropriately (operationalise)
• have an appropriate scale on y axis
• bar chart: make sure bars are not touching
• histogram: make sure bars touch
• scattergraph: make sure plot every score

Question 2

Bar charts

Answer 2

• display discrete/categorical data
• compare conditions
• use when data is divided into categories (as words)
• categories = x axis
• frequency/amount = y axis
• bars NEVER touch each other or y axis shows we are dealing with separate data

Question 3

Histograms

Answer 3

• display continuous data
• data where each ppt has an individual score
• represent frequencies
• scores with equal sized intervals = x axis
• frequency of ppt within the intervals = y axis
• if it is zero frequency interval should remain without a bar
• bars ALWAYS touch to show data is continuous
• equal width in bars

Question 4

Scattergraphs

Answer 4

• display a relationship between two co-variables
• represent correlations
• each plot on the graph represents 1 ppt but 2 scores
• one co-variable = x axis
• other co-variable = y axis
• does not matter which way around
• do not have to draw line of best fit