Standardize Name Lease Gratuito

in this video we'll be learning about zet scores and standardization by learning about both of these topics you will learn how to calculate exact proportions using the standard normal distribution what is the standard normal distribution the standard normal distribution is a special type of normal distribution that has a mean of 0 and a standard deviation of 1 because of this the standard normal distribution is always centered at 0 and has intervals that increase by 1 each number on the horizontal axis corresponds to a z-score as zetz core tells us how many standard deviations an observation is from the mean mu for example a z-score of negative 2 tells me that I am 2 standard deviations to the left of the mean and as that score of 1.5 tells me that I am one and a half standard deviations to the right of the mean most importantly a set score allows us to calculate how much area that specific z-score is associated with and we can find out that exact area using something called a z-score table also known as the standard normal table this table tells us the total amount of area contained to the left side of any value of Z for this table the top row and the first column correspond to Z values and all the numbers in the middle correspond to areas for example ing to the table a z-score of negative 1 point 9 5 has an area of 0.025 6 to the left of it to say this in a more formal manner we can say that the proportion of Z less than negative one point nine five is equal to 0.025 6 we can also use the standard normal table to determine the area to the right of any Z value all we have to do is take 1 minus the area that corresponds to that value for example to determine the area to the right of a z-score of 0.57 all we have to do is find the area that corresponds to this set value and then subtracted from 1 ing to the table the z-score of 0.57 has an area of 0.7 157 to the left of it so 1 minus 0.7 157 gives us an area of 0.28 43 and that is our answer the reason why we can do this is because we have to remember that the normal distribution is a density curve and it always has a total area equal to 1 or percent you can also use the set score table to do a reverse look-up which means you can use the table to see what that score is associated with a specific area so if I wanted to know what value of Zed corresponds to an area of 0.8 four six one to the left of it all we have to do is find zero point eight four six one on the table and see what value is that it corresponds to we see that it corresponds to a set value of one point zero two the special thing about the standard normal distribution is that any type of normal distribution can be transformed into it in other words any normal distribution with any value of mu and Sigma can be transformed into the standard normal distribution where you have a mean of zero and a standard deviation of one this conversion process is called standardization the benefit of standardization is that it allows us to use the set...