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Scores a Multiple Choice (A-E) response vector against a key.
parse_mc_bin(x, key)
An integer vector (1=correct, 0=wrong, NA=invalid).
A vector of student responses.
The correct answer key (e.g., "A", "B").
parse_mc_bin(c("a", "B", "c", "F", " b "), key = "B")
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