Percentiles and Quartiles Assignment Help

Posted on May 28, 2017

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The measure of percentile of a data is nothing but the value under which a percentage of data value falls. It might be further explained as 75% of the values of data shall lie below 75 percentile. Or if X is the fifth tallest person in a group of 25, 80% of persons are shorter than X. Simply implying that X is at the 80th percentile. If the height of X is 200cm then 200 is the 80th percentile height in the given group of people. On the other hand, quartiles indicate the values which shall divide the entire data or a part of the given data into exactly four groups. These groups so formed shall contain the equal number of observations. For instance 80% can be divided into four equal shares: 20%, 40%, 60%, and 80%. Percentiles and Quartiles Assignment Help shall provide detailed account for the computation of these two important statistical tools.
 

Computation of Percentiles And Quartiles

The computation of these is quite simple and helpful in day to day life. Percentiles and Quartiles Assignment Help shall describe the step by step methods of computing the quartiles and percentiles.
 

1.For Quartiles

The given data is firstly arranged in the ascending order. There are four quartiles: Q1, Q2, Q3 and Q4. Each quartile has a quarter of the values under it. Q2 serves as the median here or the centre of distribution. Q2 is given as the difference between the third quartile and the first. Thus, Q3 – Q1 is known as the inter quartile range and highlights the central tendency. The third and fourth quartiles of a distribution shall contain the highest values. There has to be a calculation of ‘f’ value for each data. It is given as the ratio between i-1 and n-1. Where ‘i’ is the index of value and ‘n’ is the number of values. Q1 is calculated by interpolating between the values of ‘f’ just above and below 0.25 so as to reach the value that shall be corresponding to the f value of 0.25. Similarly interpolation is carried on to get values of Q2, Q3, and Q4 for f values near 0.5, 0.75 and 1 respectively. These computational steps provided by Percentiles and Quartiles Assignment Help shall be useful to the students.
 

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2.For Percentiles

There is a subtle relation between percentiles and quartiles. As percentile shows the percentage value lying under it, the first quartile or Q1 is nothing but the 25th percentile. Likewise the Q2 or second quartile is the 50th percentile, which happens to be the median. The third quartile shall provide the 75th percentile and 4th quartile shall lastly account for the 100th percentile. Thus, Percentiles and Quartiles Assignment Help have described the process calculation of percentile as well.
 

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