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# Differences in heights

The first three plots show the heights of 136 children at ages 2, 9 and 18 years.

Heights of 136 children when aged 2 years.

Heights of the same 136 children when aged 9 years.

Heights of the same 136 people when aged 18 years.

The next three plots show the heights of the 136 children separated by gender at each age level.

Heights of 136 children when aged 2 years, split by gender.

Heights of 136 children when aged 9 years, split by gender.

Heights of the same 136 people when aged 18 years, split by gender.

Write a description of the differences observed for the first three plots and for the second three pairs of plots. Include a statement about your confidence in the differences between the populations they represent.

Examples related to rainfall can be found in Is There a Difference? and some teaching advice on meaningful differences and difficulties with informal inference is also provided.

Year 9: Identify everyday questions and issues involving at least one numerical and at least one categorical variable, and collect data directly from secondary sources (ACMSP228)

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