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[DOC File]Introduction - Pearson Education
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For grouped data, the formula for calculating the median is: Often, we will also need to calculate the upper and lower quartiles and, since the median is also the second quartile, the formula can be changed to: The number of observations to the quartile position …
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[DOC File]DESCRIPTIVE STATISTICS
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1st. quartile( 25th percentile 2nd. quartile( 50th percentile MEDIAN 3rd. quartile( 75th percentile 4th. Quartile( 100th percentile Notice that the 2nd quartile, or 50th percentile is the same as the median. Quartiles operate with the same formula for percentiles. Box and Whiskers plot
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[DOC File]MATHEMATIC WORKSHEET FOR X Grade
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To calculate the centre of measurement, the location of measurement, and the dispersion of measurement from the grouped data, altogether with their interpretations. In this chapter, you will learn : How to calculate the dispersion of measurement: inter quartile, quartile deviation, mean-deviation, variance, standard deviation, from grouped data.
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[DOC File]A statistic is a characteristic or measure obtained by ...
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First Quartile = Q1 = median of observations that fall below the median. Third Quartile = Q3 = median of observations that fall above the median. Notes. When the number of observations is odd, the middle observation is the median. This observation is not included …
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FINDING A PERCENTILE FOR GROUPED DATA
The formula for finding the percentile for grouped data is as follows. Pd = Xk + (d(n+1) – k ) (Xh - Xk ) ( h – k ) where. d is the level of the percentile you want to find. k is the greatest cumulative frequency less than or equal to d(n+1) Xk is the upper limit of the interval containing k. h …
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[DOC File]Weebly
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5.3 QUANTILES FOR GROUPED DATA. The computation of the quantiles for grouped data is the same as the computation of the median. 5.3.1 Quartiles. 1. 1st quartile: Q1 = 3. 3rd quartile: Q3 = 2. 2nd quartile: Q2 = where: L = lower boundary of the class interval which contains the quartile class
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BASIC STATISTICS - ResearchGate
The quartile for grouped data can be estimated using the following formulae. ... For the data in a frequency table, the formula for the sample variance is (5.4.2) Where n==total sample size.
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[DOC File]2
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The standard deviation and variance is computed from grouped data using the same idea used here: treat every observation in a class as though it fell at the midpoint of that class. ... She may instead decide to worry about the “middle 50% of the exits”. With 6 exits, Excel’s formula for 1st quartile gives observation (6+3)/4 ...
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[DOC File]MATHEMATIC WORKSHEET FOR X Grade
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Q1 = the lower quartile. Q2 = median. Q3 = the upper quartile. We can estimate Q1, Q2, Q3 from the cumulative frequency and calculate them with the formula. Median corresponds to the 50th percentile, Q1 corresponds to the 25th percentile, Q3 corresponds to the 75th, i.e. Q2 = P50 , Q1 = P25 , Q3 = P75 . By Formula (The Median = median
excel formula for quartiles

[DOC File]Chapter 1: Introduction
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sample lower quartile = median of lower half of data sample upper quartile = median of upper half of data If n is odd, then the median of the entire sample is included in both halves.
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Quartile formula for grouped data