Stage: 5 Challenge Level: 
To perform a Chi-squared test you need to ensure that the data are grouped into expected categories so that the expected frequencies in all of the classes are 5 or more.
How might this grouping be made to increase or decrease the final test statistic?
You will need to use tables to determine the significance of the final answer.
physics. Individual. Mathematical modelling. Statistics generally. Maths in STEM. Real world. biology. Discussion. chemistry. Chi squared tests.
Published January 2009.
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