correlationA pattern where two quantities tend to change together: both rise, or one falls as the other rises. It does not prove that one causes the other.
You’ll leave with these skills
01Find a probability by counting equally likely outcomesDivide the number of outcomes that fit the question by the total number of outcomes.
02Find a probability from a two-way table when the question names a groupFind the group named after words like “given that” or “of the,” and use that group’s total from the table as the bottom of the fraction.
03Find the chance of two draws in a row, with or without replacementMultiply the chance of the first draw by the chance of the second, lowering the counts when the first item isn’t put back.
04Find the chance that something happens at least onceFind the chance that it never happens and subtract that chance from one.
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