percentiles

percentiles : A percentile (or centile) is the value of a variable below which a certain percent of observations fall. So the 20th percentile is the value (or score) below which 20 percent of the observations may be found. The term percentile and the related term percentile rank are often used in descriptive statistics as well as in the reporting of scores from norm-referenced tests. The 25th percentile is also known as the first quartile(Q 1); the 50th percentile as the median or second quartile(Q 2); the 75th percentile as the third quartile (Q 3). There is no standard definition of percentile , however all definitions yield similar results when the number of observations is large. One definition, usually given in texts, is that the $p$-th percentile of $N$ ordered values is obtained by first calculating the rank $n\; =\; \backslash frac\{N\}\{100\}\backslash ,p+\backslash frac\{1\}\{2\}$, rounding to the nearest integer, and taking the value that corresponds to that rank. An alternative meth....   More from Wikipedia

percentiles : The percentile rank of a score is the percentage of scores in its frequency distribution which are lower or equal to it. For example, a test score which is greater than or equal to 85% of the scores of people taking the test is said to be at the 85th percentile. Percentile ranks are commonly used..   More from Wikipedia

percentiles : Mensa International is the largest, oldest, and most well-known high IQ society in the world. See also: Mind & Brain Intelligence Psychology Neuroscience The organization restricts its membership to people with high testable IQs. Specifically, potential members must score within the top 2% (98th percentile) of any approved standardized intelligence test. Mensa has three stated purposes: to identify and foster human intelligence for the benefit of humanity; to encourage research in the nature, characteristics, and uses of intelligence; and to promote stimulating intellectual and social opportunities for its members.. For more information about the topic Mensa International, read the full article at Wikipedia.org, or see the following related articles: Aptitude — An aptitude is an innate inborn ability to do a certain kind of work. Aptitudes may be physical or mental. Aptitude and intelligence quotient are ...  > read more Intellectual giftedness — Intellectual giftedness is an int....   More from Science Daily

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  How to calculate Z-scores and determine percentiles on a Z-table

Question : My son had his 2 month check up on Monday. He is in the 50th percentile for weight and the 75th percentile for height. How do they come up with the percentiles?

Answer : They collect information from a large sample of babies. Make a normal distribution curve (like a bell curve from math class)... then according to the mean and the overall picture they see where your child is, then compare they to the rest of the sample (i.e. other children the same age). If your child is in the 50th percentile he is right in the middle or he weighs more than 50% of other babies, and 50% less than other babies his age. The 75% means he is taller than 75% of babies and shorter than 25% of babies his age...   More from Yahoo Answers

Question : The following are the P/E ratios (price of stock divided by projected earnings per share) for banks. 20, 18, 15, 21,14,23, 19, 22, 18, 15, 19, 23, 25, 29, 22, 38, 22, 22. Find the 25th & 60th percentile

Answer : arrange the numbers ... highest to lowest... 0.25*18 = 4.5 ... we need the number between 4 & 5 the 25th percentile is 18 .. . . 0.6*18 = 10.8 the 60th percentile is 22 .. . .. ...   More from Yahoo Answers

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