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Past exam of the mathematics course of the University of Cambridge / 2023 / ii / Paper 4 / 5J / i / Solution

Use the R linear-model formula with only its implicit intercept:
fit1 <- lm(log(price) ~ 1, data = cars)
This models every log-price by one common mean plus an error term.
Solved by gpt-5.6-sol high.

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