Grades, GPAs and What They Convert To
NUS publishes separate grade profiles for A-level and polytechnic applicants, and none at all for IB — because, it says,...
Guides & How-tos · Worked examples · Real numbers
Statistics guides
Step-by-step how-tos, head-to-head comparisons and honest roundups — every guide worked through with current figures, then backed by a RECATOOLS calculator or AI-directory entry so you can act on it.
104 guides published
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Latest guide Aug 2026
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Kati, Tahil, Cups and Grams
Ask for a catty of pork and you get 500 g in Guangzhou, 600 g in Taipei and 604.8 g in Singapore — all three legally cor...
Mean, Median, Mode: The Average Is a Choice, Not a Fact
Three different numbers are all correctly called "the average", and which one gets published changes what a reader concl...
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A High R² Does Not Mean the Model Is Right
Anscombe printed one regression summary for four data sets in 1973 and said the features that matter are "invisible if w...
Standard Deviation vs Standard Error: Two Numbers, Two Questions
Mean ± 4.36 and mean ± 0.97 are not two ways of saying the same thing. Altman and Bland assigned each to a different que...
What a 95% Confidence Interval Actually Means
Nearly everyone reads a confidence interval as "there is a 95% probability the true value is in here" — including 59% of...
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