How to find the first quartile range

    • [PDF File]UNIT 4 RANGE, MD, SD AND QD and QD - eGyanKosh

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      The inter-quartile range is a measure of dispersion and is equal to the difference between the third and first quartiles. Half of the inter-quartile range is called semi inter-quartile range or Quartile deviation. Symbolically it is defined as; Q.D = (Q 3 - Q 1)/ 2 Where Q 1 and Q 3 are the first and third quartiles of the data. The quartile

    • [PDF File]Unit 8, Lesson 15: Quartiles and Interquartile Range - Online Math Learning

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      cutthe data into fourths is called aquartile. Themedian, which cuts the data into a lowerhalf and an upper half, is the second quartile (Q2). The first quartile (Q1) is the middle value of thelower half of the data. The third quartile (Q3) is the middle value of the upper half of the data. Here is a set of data with 11 values.

    • [PDF File]Interquartile Range Z -Scores - University of Houston

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      Q 1 = 1st quartile = 25th percentile (P 25) Q 2 = 2nd quartile = 50th percentile = median (P 50) Q 3 = 3rd quartile = 75th percentile (P 75) Quartile Example Using the applicant (aptitude) data, the first quartile is: Rounded up Q 1 = 13th ordered value = 46 Similarly the third quartile is: P 100 n • = (50)(.75) = 37.5 ˜ 38 and Q 3 = 75

    • IXL | Interquartile range

      To find the interquartile range of a data set, find the difference between the third quartile (Q) and the first quartile (Q). What are quartiles? Quartiles divide a data set into quarters, or four parts. •Q is the upper quartile. It is the median of the upper half of data. •Q is the middle quartile. It is the same as the median of the data set.

    • [PDF File]Inter-Quartile Range, Outliers, Boxplots. - Simon Fraser University

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      Quartile Range. (Literally range the between the quartiles, called the IQR for short). - The Inter-Quartile range is calculated: IQR = Q3 – Q1 - The size of the IQR indicates how spread out the middle half of the data is. Outliers (1.5 x IQR Rule) - Now that we have a measure of spread, we can use

    • [PDF File]Quartiles within SAS

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      To understand the different methods used to calculate quartiles, you first need to understand what a quartile is. When ... quartile is the part that contains the next-lowest data values. Similarly the upper quartile can also be the cut-off value (referred to as Q3 or UQ) between the upper middle quartile ...

    • [PDF File]Stats and Probability - Scilab

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      The inter-quartile range: IQR = Q3-Q1 where Q1 and Q3 are known as the first and third quartiles, respectively. The second quartile is the median, i.e., Q2 = xm. These values are called quartiles because they represent the points that divide the ordered sample into fourths (Latin: quarta). Thus,

    • [PDF File]median interquartile range - University of California, Berkeley

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      A measure of dispersion that accompanies the median is the interquartile range (IQR). It is the distance between the upper and lower quartiles. To find the quartiles and median, put the numbers in order from smallest to largest. Then if there are an odd number of numbers in the list the median can be found by counting

    • [PDF File]10.4 Box-and-Whisker Plots - Big Ideas Learning

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      out below or above the median? Explain. (c) Find and interpret the interquartile range of the data. The fi gure shows how data are distributed in a box-and-whisker plot. first quartile third quartile About of the data are in each whisker. 1 4 About of the data are in each whisker. 1 4 About of the data are in the box. 1 2 Study Tip A long ...

    • [PDF File]11.2 Notes: Interpreting Box and Whisker Plots - Tamalpais Union High ...

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      median of the lower half is the first quartile, Q1 . The median of the upper half is the third quartile, Q3. The five numbers that make up a box-and-whisker plot are called the . five-number summary of the data set. These are the mimimum, Q1, Median, Q 3, and maximum values. Example: The numbers of first cousins of the students in a ninth-grade ...

    • [PDF File]Median and Interquartile Range -- Nonparametric Univariate Statistics ...

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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]Mean, Median, Mode, Range, & Quartiles - Lower Moreland Township School ...

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      On her first five history tests, Yoko received the following scores: 82, 96, 92, 83, and 91. ... Find the range of values. Find the mean of the values. Find the mode of the values. ... subsets, each containing ¼ or 25% of the data. Example 6b: Quartiles Find the Quartile 1, Quartile 2, and Quartile 3 for the below data. 22, 16, 35, 26, 14, 17 ...

    • [PDF File]Stat 201: Business Statistics I Student Name: - University of Cincinnati

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      Find the z-scores for the highest and lowest exam scores. Determine the quartile or interquartile range as specified. 22)The test scores of 15 students are listed below. Find the first quartile, Q 1. 42 49 53 55 60 64 66 71 74 77 85 87 90 94 95 23)The test scores of 19 students are listed below. Find the interquartile range. 91 47 86 70 59

    • [PDF File]Lecture 7 Range, Quartiles and IQR - Mr. Manoo Murthy

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      Definition: Range, Quartile, and Interquartile Range Definition Range The spread between the largest data entry and the smallest data entry. Definition Quartiles The points at which the data set is split into 4 equal parts. Definition Interquartile Range [IQR] The data range that contains the middle 50% of the entries. Range = largest number –smallest number

    • [PDF File]Median: Interquartile Range - Math 6

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      Find the median, first quartile, third quartile, and interquartile range of the data. 11. 40, 33, 37, 54, 41, 34, 27, 39, 35 ... Find and interpret the range and the interquartile range of the distances. Distances (feet) 13- 10- 29 21- 19 16-1 21 32 26— 18- Title:

    • [PDF File]9 MEASURES OF DISPERSION - The National Institute of Open Schooling (NIOS)

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      (a) variance (b) inter-quartile range (c) range (d) coefficient of variation 2. A researcher has collected the following sample data. The mean of the sample is 5. 35 12 32 The range is (a) 1 (b) 2 (c) 10 (d) 12 9.2.2 Quartile Deviation It is based on the lower quartile Q 1 and the upper quartile Q 3. The difference Q 3 Q 1 is

    • [PDF File]Quartiles, Deciles, and Percentiles - Bahria University

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      Each quartile contains 25% of the total observations. Generally, the data is arranged from smallest to largest: First quartile: the lowest 25% of numbers Second quartile: between 25.1% and 50% (up to the median) Third quartile: 50.1% to 75% (above the median) Fourth quartile: the highest 25% of numbers

    • [PDF File]10.2 Box-and-Whisker Plots - Big Ideas Learning

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      In Exercises 1–6, use the box-and-whisker plot to find the given measure. 1. least value 2. range 3. first quartile 4. third quartile 5. greatest value 6. median In Exercises 7 and 8, make a box-and-whisker plot that represents the data. 7. Numbers of chairs in a classroom: 30, 27, 32, 25, 12, 22, 20, 29, 35, 35, 28 8.

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