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Line graphs
Line graphs tell the story of how something has changed over time. Your data needs to be numerical (such as lengths, temperatures, percentages or weights) and measured over a time period (such as a week...
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Kite Diagrams Free
Kite diagrams provide a graphical summary of different observations made along a transect. When to use Features Kite diagrams provide a graphical summary of different observations made along a transect. ...
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Bubble Graphs
Bubble graphs are a variation of X-Y scatter graphs where the size of the plotted points indicates the frequency of that data point. These graphs can be complicated to interpret so they should be used...
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Box & Whisker Plots Free
Box & whisker plots (also called five-number summary plots) show the minimum, first quartile, median, third quartile and maximum values of a data set. When to use Features Box-and-whisker plots show...
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Bar Charts & Histograms
Both bar charts and histograms show how often something occurs.A bar chart shows the frequency of different events occurring. The height of each bar indicates the frequency of each event.If the values...
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Measures of Variability
Measures of variability While a measure of central tendency describes the typical value in a data set, measures of variability define how far away the data points fall from the centre. A low spread/variability...
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Measures of Central Tendency
Measures of central tendency are numbers that describe where the centre of a dataset is located. This section explains the differences between the mean, mode and median. Mean, mode & median The arithmetic...
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Outliers in your Data
Outliers are unusual values in your data. Unfortunately, there are no strict statistical rules for identifying them. But this section gives some guidelines and statistical tests you can use to identify...
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Types of Data
Once you have decided how you will isolate your sample, you need to start collecting data from it. This section defines the different types of data you might collect. Types of data It is important that...
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Populations & Samples
Usually it is not practical to question everyone or record everything in a population, so a sample is chosen – a smaller group that belongs to the population. This section explains the differences between...