Skewness and outliers Quiz

1. Mean 30, median 26, mode 22. What is the skewness?

• A. Negative
• B. Symmetrical
• C. No skew
• D. Positive

2. $Q_1=10$, $Q_2=15$, $Q_3=18$. What is the skewness?

• A. Negative skew
• B. Positive skew
• C. Symmetrical
• D. Cannot tell

3. $Q_1=20$ and $Q_3=32$. Using the $1.5\times IQR$ rule, what is the upper limit for outliers?

• A. $44$
• B. $48$
• C. $50$
• D. $38$

4. On a box plot, where does an upper whisker end if there is one high outlier?

• A. At the outlier
• B. At the upper quartile
• C. At the largest value that is not an outlier
• D. At the mean

5. Mean 50, standard deviation 6. A value is an outlier if it is more than 2 standard deviations from the mean. Which value is an outlier?

• A. $60$
• B. $63$
• C. $41$
• D. $39$