Whole-site statistics and citation audit - #55
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Before: a handful of statements across the course were true only under an unstated condition, one quiz answer key overstated (adjusted R-squared "falls" for a noise predictor), and several wrong-answer messages diagnosed the wrong mistake.
After: every quoted number was checked against fresh real-R output of all 298 lesson blocks and 405 exercise runs; none were wrong. The conditional statements now state their condition, the answer key says "usually falls" with the reason, and the feedback names the actual mistake.
How: eight read-only audits (seven by module, one for citations, simulations and R error help), each finding verified before editing. New check branches (m13 time-2 differences, m16 whole-company interval) are covered by the real-R validator in CI.