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- Statistics. Cambridge, UK New York: Cambridge University Press. ISBN 978-0521593465. "What is the difference between ordinal, interval and ratio variables...30 KB (4,015 words) - 16:59, 17 May 2024
- Statistics. Cambridge and New York: Cambridge University Press. ISBN 978-0521593465. Hayes, Adam. "Null Hypothesis Definition". Investopedia. Retrieved...39 KB (5,318 words) - 22:38, 18 June 2024