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A negative z-score indicates that the observed value (or statistic) was below the mean. In non-directional tests, a negative z-score is just as likely as a positive one.

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Q: How do you interpret a negative z- score?
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What is the meaning of a negative z score?

A negative z score is a value that is less than the mean value.

What does a negative z-score mean?

z-score of a value=(that value minus the mean)/(standard deviation). So if a value has a negative z-score, then it is below the mean.

Is it true any score with value less than the population mean will have a negative z-score?

Yes. If a score is below the mean, the z score will be negative.

Does a negative z score yield a negative probability value?

no, z score can be negative but a probability is a always positive between 0 and 1.

How do you find probabilty of negative z score?

Let z be positive so that -z is the negative z score for which you want the probability. Pr(Z < -z) = Pr(Z > z) = 1 - Pr(Z < z).

How do you change a negative z score to a decimal?

In the same way that you would convert a positive z-score. Only leave a negative sign in front of it.

What is measured by the sign of a z-score?

The sign of the z score is negative if the observation was below the mean and positive if it was greater.

Can a negative z score be greater than a positive z score?

Assume the z-score is relative to zero score. In simple terms, assume that we have 0 < z < z0, where z0 is the arbitrary value. Then, a negative z-score can be greater than a positive z-score (yes). How? Determine the probability of P(-2 < z < 0) and P(0 < z < 1). Then, by checking the z-value table, you should get: P(-2 < z < 0) ≈ 0.47725 P(0 < z < 1) ≈ 0.341345

What does the z score of - 1.3 mean?

A z score of -1.3 means that the score is located at the negative 1.3 sigma level with respect to the mean.

What is a z- score considered to be if it is less than negative two or greater than two?

The z score is -2 or +2!

How do you know if a z score is positive or negative?

A negative Z-Score corresponds to a negative standard deviation, i.e. an observation that is less than the mean, when the standard deviation is normalized so that the standard deviation is zero when the mean is zero.

What does a negative z score mean?

It means that it is less than the mean.