Determining the upper percentage of a population in statistics only requires that you follow a few basic, easy to manage steps. Determine the upper percentage of a population in statistics with help from a mathematics educator in this free video clip.
Hi, I'm Jimmy Chang, and we're here to talk about how to find the upper percentage of a population in statistics. Now, frankly to find that it really depends on what kind of distribution that you have. Now, for example, if you have a normal distribution, it all starts with the Z score formula where Z is equal to the data point minus the mean over the standard deviation. Now, the upper percentage of a population in normal distribution for example is using the bell shape curve and the upper population is over here. So, that's, that will be the upper percentage. Now, once you find the Z score, what you want to do is look at how the Z score table is drawn. Now, it all varies by the statistics book, but more often than not, they're going to give you the lower percentage population. And so, to find the upper percentage of a population, more often than not you may need to do one minus the lower percentage decimal. So, for example, if your lower percentage decimal was, let's just say, .92, then you'll be subtracting 1-.92, that'll give you 0.08. So, that means this upper percentage population is going to be .08 or eight percent if you will. So, it really depends on the distribution that you have and once you have that, find the appropriate score and then find, it'll give you the percentage and you subtract from one if necessary. So, I'm Jimmy Chang, and that's a glimpse on how to find the upper percentage of a population in statistics.