Final answer:
To compare two subgroups of one variable with a minimum of 25 observations in each subgroup, you can use statistical tests such as t-test or chi-square test.
Step-by-step explanation:
In this case, you're looking to compare two subgroups of one variable. Each subgroup should have a minimum of 25 observations, so you'll need a total of at least 50 numbers. To compare the two subgroups, you can use statistical tests such as t-test or chi-square test.
If the variable is numerical, you can use a t-test to compare the means of the two subgroups. If the variable is categorical, you can use a chi-square test to compare the proportions of the two subgroups.
Make sure to collect your data randomly and independently, and ensure that you have at least five successes and five failures in each subgroup.
Also, ensure that the sample size is not too large compared to the population size to avoid over-sampling.