# Descriptive Statistics Part 2 – Graphs

Teachers or students who want the original PPT please tweet @psychopepper

#### Learning Objectives

- 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.

### Lesson Outline:

#### Tasks:

- 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.

#### Content Recap:

**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:
- Textbooks affectionately known as catbook (Year 1) dogbook (Year 2).
- Revision Guides affectionately known as kittenbook (Year 1) puppybook (Year 2).
- Exam Companions also affectionately known as kittenbook (Year 1) puppybook (Year 2).
- Research Methods guide

- Psychology for A Level:
- Textbooks affectionately known as green hair girl (Year 1) pink hair girl (Year 2)
- Revision Guides affectionately known as green hair girl (Year 1) pink hair girl (Year 2)

- CGP

**Extra Reading** – Elephants on Acid or Hippo Eats Dwarf