![]() What is the approximate z-score? Remember, z-scoreĪre away from the mean. Statistics examination scores were not normally distributedĭeviation of 1.34. So this is problem number fiveįrom the normal distribution chapter from 'sĪP statistics FlexBook. And if you want to measure the percentage of both tails, then you need to measure the left tail of the higher number, subtract that from one to give you the right tail of the higher number, and then add in the left tail of the lower number to get the area you want from the z-score table.Ī bit more practice. And if you want the area between two points, you need to calculate the left tail of the higher number and then subtract the left tail of the lower number to rule out the part of the curve that you don't want to measure. So that's great if you want the left tail of a distribution, but if you want a right tail then you need to calculate the left tail and subtract it from 1 (which is the area of the entire standard normal curve). ![]() ![]() Remember (and they usually draw a picture on the z-score table to drive this point home) that the z-score measures the whole area from your point to the left. ![]() When you're starting (and sometimes after you're used to it), it helps a lot to draw a picture of a bell curve and shade in the part that you're trying to measure. ![]()
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