Outliers and cleaning data

Outliers and cleaning data Quiz

Spec 2.4 · Edexcel A-Level Maths: Quiz

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5 questions, one answer each

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  1. 1. A data set has Q1=10Q_1=10 and Q3=18Q_3=18. By the 1.5×1.5\timesIQR rule, what is the upper limit?

    • A. 30
    • B. 26
    • C. 28
    • D. 34

  2. 2. The mean is 50 and the standard deviation is 4. Using the 3 standard deviation rule, which value is an outlier?

    • A. 60
    • B. 38
    • C. 44
    • D. 63

  3. 3. A suspected outlier is due to a decimal point error and the true value is known. What should you do?

    • A. Leave it in
    • B. Correct it
    • C. Replace it with the mean
    • D. Delete the whole data set

  4. 4. Which statistic is least affected by an outlier?

    • A. Mean
    • B. Range
    • C. Standard deviation
    • D. Median

  5. 5. A value is missing from a data set. Which is a valid way to deal with it?

    • A. Replace it with 0
    • B. Replace it with the largest value
    • C. Omit it, stating that the sample is smaller
    • D. Double the next value

Quiz