Statistical
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Safin(讨论 | 贡献)2022年4月27日 (三) 08:09的版本 (建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=statistical+etymology&newwindow=1&hl=en ref] late 18th century: from German statistisch (…”的新页面)
late 18th century: from German statistisch (adjective), Statistik (noun).
wiktionary
statistic + -al
etymonline
statistical (adj.)
1787, from statistics + -al (1). Related: Statistically.