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What is interquartile range (IQR)?
Interquartile Range The interquartile range (IQR) is essentially the middle 50% of the data set IQR = Q3- Q1 Using the applicant data, the IQR is: IQR = 75 - 46 = 29 Z -Scores qZ -score determines the relative position of any particular data value x and is based on the mean and standard deviation of the data set

What is a quartile range based on applicant aptitude?
Using the applicant (aptitude) data, the first quartile is: Rounded up Q1= 13th ordered value = 46 Similarly the third quartile is: P 100 n • = (50)(.75) = 37.5 ˜ 38 and Q3= 75 n • = (50)(.25) = 12.5 P 100 Interquartile Range

What is a quartile example?
Quartile Example Using the applicant (aptitude) data, the first quartile is: Rounded up Q1= 13th ordered value = 46 Similarly the third quartile is: P 100 n • = (50)(.75) = 37.5 ˜ 38 and Q3= 75 n • = (50)(.25) = 12.5 P 100

[PDF File]Interquartile Range LESSON - Maths Panda
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The interquartile range, IQR, is the range of the middle 50% of the data set. Interquartile range = Upper quartile — Lower quartile = Q3 − Q1 The interquartile range is a useful measure when there are extreme values at either or both the ends. Page 1 of 2 E.g. 1 www.mathspanda.com

[PDF File]Lecture 7 Range, Quartiles and IQR - Mr. Manoo Murthy
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Explain the following terms: measure of spread, range, quartiles, and interquartile range. Calculate the range, quartiles, interquartile range, and five – number summaries with ungrouped and grouped frequency tables. Determine when it is appropriate to use these measures of spread in analysis.

[PDF File]Median and Interquartile Range -- Nonparametric Univariate ...
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The interquartile range (IQR) is the range of values within which reside the middle 50% of the scores. The lower bound of the interquartile range is called the first quartile (Q1) -- 25% of the scores have a value lower than Q1 and 75% of the scores have a value larger than Q1.

[PDF File]Unit 8, Lesson 15: Quartiles and Interquartile Range
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measure of spread that goes with the median called theinterquartile range (IQR). Finding the IQR involves partitioning a data set into fourths. Each of the three values that cutthe data into fourths is called aquartile. Themedian, which cuts the data into a lowerhalf and an upper half, is the second quartile (Q2).

[PDF File]Measures of Dispersion - Brown University
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Interquartile range rule for detecting outliers 1. Calculate the interquartile range (Q3-Q1). 2. Multiply the interquartile range (IQR) by 1.5. 3. Add 1.5 x IQR to the third quartile. This value is called the upper fence. Values greater than this are suspected outliers. 4. Subtract 1.5 x IQR from the first quartile. This value is called the ...

[PDF File]Interquartile Range Z -Scores - University of Houston
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The interquartile range (IQR) is essentially the middle 50% of the data set IQR = Q3- Q1 Using the applicant data, the IQR is: IQR = 75 - 46 = 29 Z -Scores qZ -score determines the relative position of any particular data value x and is based on the mean and standard deviation of the data set

Find the interquartile range iqr