METHODS OF DATA ANALYSIS
MEASURES OF DISPERSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Given the data:136, 150, 119, 150, 125, 140.Find the upper quartile (Q3). (Hint ____ put the numbers in order and find the median to help you find Q3)
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125
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150
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139.5
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143
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Explanation:
Detailed explanation-1: -Example: Box and Whisker Plot and Interquartile Range for In this case all the quartiles are between numbers: Quartile 1 (Q1) = (4+4)/2 = 4. Quartile 2 (Q2) = (10+11)/2 = 10.5. Quartile 3 (Q3) = (14+16)/2 = 15.
Detailed explanation-2: -Lower Quartile (Q1) = (N+1) * 1 / 4. Middle Quartile (Q2) = (N+1) * 2 / 4. Upper Quartile (Q3 )= (N+1) * 3 / 4. Interquartile Range = Q3 – Q1.
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