IPA: /nɒnstəˈtɪstɪkəl/
KK: /nɑnstəˈtɪstɪkəl/
Not related to statistics or statistical methods.
The nonstatistical approach to the problem provided a different perspective.
Nonstatistical → It is formed from "non-" (meaning not) and "statistical" (from Latin "status", meaning state or condition, combined with the suffix "-ical", meaning pertaining to). The word "nonstatistical" means not pertaining to statistics or data analysis.
Think of 'non-' meaning not, and 'statistical' relating to states or conditions of data — so nonstatistical refers to something that does not relate to data analysis.