By combining cells we guard against having an inflated test statistic that could have led us to incorrectly reject the H0.

Question

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Combining cells in statistical tests, such as chi-square tests, reduces the degrees of freedom and can help address small expected frequencies in some cells, thus reducing the risk of an inflated test statistic that might lead to incorrectly rejecting the null hypothesis (H0).

By Combining Cells We Guard Against Having an Inflated Test