Descriptive Statistics Part 2 – Graphs
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- To KNOW and UNDERSTAND what graphs are in psychology.
- To APPLY this knowledge of graphs to the grass head project.
- To ANALYSE the types of graphs in order to EVALUATE when to use them.
- To discuss the basics of graphs drawing, including titles, axis, colour and clarity.
- To reflect on notes in booklet bar charts, histograms and line graphs.
- To use data given in booklet in order to draw a bar chart, histogram and line graph.
- To use data given in booklet to identify some common problems in data collection a graph drawing.
- To assess graph drawing /15.
- To choose a suitable graph and draw it for the grasshead project.
- To attempt a past question on graph interpretation.
Bar Chart: A bar graph is a chart that uses mostly vertical (although sometimes horizontal) bars to show comparisons among categories. It is because the data is on categories that the bar DO NOT TOUCH. the X axis of the chart shows the specific categories being compared, and the Y axis represents a discrete value/frequency. Bar charts are used for nominal data and some bar graphs present bars clustered in groups of more than one.
Histogram: A graphical display where the data is grouped into ranges (such as “40 to 49”, “50 to 59”, etc), and then plotted as bars. Similar to a Bar Graph, but in a Histogram each bar is for a range of data. It is because the data is in a continuous range that the bar DO TOUCH. the X axis of the chart shows the continuous measurement being used, and the Y axis represents the frequency. Histograms are used for ordinal data – where the data can be put into order smallest to largest.
Line Graph: A line chart or line graph is a type of chart which displays information as a series of data points called ‘markers’ connected by straight line segments.. Similar to a histogram, the X axis of the chart shows the continuous measurement being used, and the Y axis represents the frequency. Again similar to histograms, line graphs are used for ordinal data – where the data can be put into order smallest to largest. However they also allow us to plot more that one condition on top of one another for comparison.
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Study Notes (TBC):
If you would like to download a set of study notes for this lesson, you can do so here. If you would like access to the original word file please tweet @psychopepper
TEXTBOOKS OR EXTRA READING:
I would suggest that you have a copy of one of the textbooks which will allow you to read around the subject matter, pre-read ahead of lessons or even take extra notes/practise questions afterwards. I would recommend the following (you do not need to replicate books, one of each type is plenty!)
- Complete Companion Series:
- Psychology for A Level: