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Apr
Calculate Percentile Normal Distribution. We can calculate this value in Stata two different ways. On exam questions the mean and standard deviation may be provided or you may need to calculate them so make sure you know how to do that Then we take our z-score and check the z-table to find the p-value of that score. μ 1 0. Added May 6 2013 by mrbartonmaths in Mathematics.
First we will obtain the 90th percentile of the standard normal distribution and then back-transform or un-standardize it to get back to the unscaled height distribution. Assume that the population mean is known to be equal to. Standard normal failure distribution. Sigma 5 σ 5. Z_p 0842 zp. You can use the inverse erf function which is available in MatLab and Mathematica for instance.
First we will obtain the 90th percentile of the standard normal distribution and then back-transform or un-standardize it to get back to the unscaled height distribution.
If youre given the probability percent less than x and you need to find x you translate this as. The dot plot shows the number of hours of daily driving time for 14 school bus drivers each dot represents a driver so for example one driver drives one hour a day two drivers drive two hours a day one driver drives three hours a day it looks like theres five drivers that drive seven hours a day which of the following is the closest closest estimate to the percentile rank for the driver with a daily driving time of. The 90th percentile c. μ 1 0. You can use the inverse erf function which is available in MatLab and Mathematica for instance. To compute the 90 th percentile we use the formula Xμ Zσ and we will use the standard normal distribution table except that we will work in the opposite direction.