Can anyone explain when should I add 0.5 to the

arridsd9

arridsd9

Answered question

2022-06-21

Can anyone explain when should I add 0.5 to the z-score?

Answer & Explanation

Amy Daniels

Amy Daniels

Beginner2022-06-22Added 20 answers

Based on the example you give in your comment above, I think what's being used is that P ( z < 0 ) = 0.5 (and P ( z > 0 ) = 0.5, too), so that P ( z 1.35 ) = P ( ( z < 0 )  or  ( 0 z 1.35 ) ) = 0.5 + P ( 0 z 1.35 )
Sattelhofsk

Sattelhofsk

Beginner2022-06-23Added 5 answers

If your problem involves binomial probabilities, and you wish to use the normal approximation to the binomial, you would add .5 to the z formula (not the score) as a continuity correction factor.

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