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The following shows an example of the \chi ^2 method applied to experiments performed by the biologist Gregor Mendel (July 20, 1822 – January 6, 1884).
In one of his famous experiments (sometimes called Mendel's First Experiment) he crossed strains of garden peas with yellow and green seeds. He then allowed the F_1 generation (which were all yellow) to self-fertilize, collected the resulting seeds and grew them all. In the resulting F_2 generation, he found that the ratio yellow:green was 3:1.

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## Glossary

### union

The union of two sets A and B is the set containing all the elements of A and B.

Full Glossary List

## This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AQA A-Level (UK - Pre-2017)S4Goodness of fitXTRA-
Edexcel A-Level (UK - Pre-2017)S3Goodness of fitXTRA-
Edexcel AS Further Maths 2017Further Statistics 1ExtraGoodness of Fit - Extra-
Edexcel AS/A2 Further Maths 2017Further Statistics 1ExtraGoodness of Fit - Extra-
I.B. Higher Level7Goodness of fitXTRA-
OCR A-Level (UK - Pre-2017)S3Goodness of fitXTRA-
OCR AS Further Maths 2017StatisticsExtraGoodness of Fit - Extra-
OCR MEI AS Further Maths 2017Statistics AChi-Squared TestsGoodness of Fit - Extra-
OCR-MEI A-Level (UK - Pre-2017)S3Goodness of fitXTRA-
Universal (all site questions)GGoodness of fitXTRA-