Perhaps you should try some spelling variations:
statistical inferences » statistical inference, statistical convergence, statistical independence
statistical theories » statistical theory, statistical tests, statistical tables
statistical studies » statistical study
statistical survey » statistical society, statistical shape, statistical study

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((statistical services) OR (((((statistical studies) OR (statistical survey))) OR (statistical theories))))) OR (statistical inferences)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((statistical services) or (((((statistical studies) OR (statistical survey))) or (statistical theories))))) or (statistical inferences))".
• Adding a wildcard symbol may retrieve word variants: ((((statistical services) or (((((statistical studies) OR (statistical survey))) or (statistical theories))))) or (statistical inferences))*.