Outliers and data cleaning

Outliers and data cleaning Quiz

Spec L4 · AQA A-Level Maths: Quiz

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5 questions, one answer each

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1. $Q_1=10$ and $Q_3=18$ . Using the $1.5\times$ IQR rule, above which value is an outlier?
- A. 26
- B. 28
- C. 30
- D. 36
2. Mean 20, standard deviation 4. Using the 2-standard-deviation rule, which value is an outlier?
- A. 29
- B. 27
- C. 28
- D. 12
3. A value is large but the source shows it is genuine. What should you do?
- A. Delete it
- B. Replace it with the mean
- C. Keep it and comment on its effect
- D. Ignore the rest of the data
4. A spreadsheet cell is blank. What is the best treatment?
- A. Treat it as 0
- B. Exclude it from calculations and note it
- C. Replace it with the largest value
- D. Delete the entire data set
5. Which measure is least affected by an outlier?
- A. mean
- B. range
- C. standard deviation
- D. median