For example, there’s no point in knowing that someone’s weight is 150 pounds when you are looking at the weights of numerous people that are recorded in kilograms. When you are using z scores, it is important that you have something to compare them against or they may be meaningless. Notice that w are referring to the results from surveys and tests that can have thousands of possible units or results. When you are looking at z scores, this is the same as saying that you are comparing the results from a test to a “normal” population. We can also stat that z scores can range between -3 standard deviations (which are the ons that are located on the left of the normal distribution curve) and +3, which ar the ones that are located on the right of the normal distribution curve. Besides, it is worth to point out that you can place the z score on a normal distribution curve.ĭiscover how to find a confidence interval. One of the things that you should keep in mind is that sometimes, the z score is also referred to as a standard score.
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