MATH 10 QTR 4 : Quartiles, Deciles, and Percentiles

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12 Terms

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Measures of Position

a measure by which the position of data is determined through its value

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Quartiles

  • are values which divide a list of ordered numbers into 4 equal parts.

  • denoted by Q1, Q2, and Q3

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Quartile Formula

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1st Quartile (Q1)

the middle value between the smallest value and the median

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2nd Quartile (Q2)

median of the data

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3rd Quartile (Q3)

is the middle value between the median and the highest value

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Deciles

  • are values that divide the date set into 10 equal parts.

  • which are denoted by D1, D2, D3, …, D9

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Percentile

  • divide the data set into 100 equal parts

  • denoted as P1, P2, P3, and P99

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Class Interval

  • is the numerical width of any class in a distinct distribution.

  • it is the difference between the upper and lower class limit

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Upper Class Limit

is the highest value of the class interval

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Lower Class Limit

is the lowest value of the class interval

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Frequency

is the number of times a particular value appears in a set of data