See related link. Also called standard score.
Chat with our AI personalities
If the distribution is Gaussian (or Normal) use z-scores. If it is Student's t, then use t-scores.
No, the Z-test is not the same as a Z-score. The Z-test is where you take the Z-score and compare it to a critical value to determine if the null hypothesis will be rejected or fail to be rejected.
z-scores are distributed according to the standard normal distribution. That is, with the parameters: mean 0 and variance 1.
No, they do not. They are pure numbers.
Z scores are used for standardized testing done by most school districts. It is the most common way of standardizing data. IQ scores can be standardized using z scores. The mean is 100 and the standard deviation is 15. You use the t score when the sample is small, <30 often. Many behavior ratings use t scores.