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Evaluate Student Work for Mathematical Quality
Grade Level
Praxis Core
5165.296 Evaluate Student Work for Mathematical Quality
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A student writes P(A given B) = P(A and B)/P(A). Which evaluation is strongest?
A
The formula is invalid because conditioning on B requires dividing by P(B), assuming P(B) is nonzero.
B
The explanation is imprecise only because probabilities should be percentages.
C
The statement is coherent because P(A given B) and P(B given A) are always equal.
D
The formula is valid because conditional probability always divides by the probability of the first event named.
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