It's common practice that the 'expected' values of a chi-squared test should be 5 or higher, with adjacent groups to be merged until this is the case (at UK A-l

It's common practice that the 'expected' values of a chi-squared test should be 5 or higher, with adjacent groups to be merged until this is the case (at UK A-level this is strictly required). This is a slightly conservative correction and Wikipedia agrees that no correction is required in this case: https://en.wikipedia.org/wiki/Pearson%27s_chi-squared_test#Problems https://en.wikipedia.org/wiki/Pearson%27s_chi-squared_test#P...