Practicing R for Statistical Computing by Muhammad Aslam & Muhammad Imdad Ullah
Author:Muhammad Aslam & Muhammad Imdad Ullah
Language: eng
Format: epub
ISBN: 9789819928866
Publisher: Springer Nature Singapore
A plot of cumulative probabilities for a standard normal distribution can be drawn using the function pnorm() (Fig. 7.5).
Fig. 7.5 Plot of cumulative standard normal distribution
qnorm():
Suppose that IQ score follows normal distribution having an average score of 100 with a standard deviation of 15. We are interested in finding the 95th percentiles of the distribution of IQ scores.
Since qnrom() function is the inverse of the CDF (pnorm() function). The qnorm() can be used to find the Z-score of the pth quantile of the standard normal distribution.
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