Answer:
Dictatorship
Explanation:
An example of a country with a dictatorship is Chad(Which is in Africa)
It would add tax to his businesses
The answer that fits the blank is the term CHANCE. There would always be variability between the groups because of the variability of the given samples and how these samples are being treated in the first place. This is when chances enter.
Dictatorship, I believe is what you are looking for.