Practice quiz: Thinking with data

4 questions. Pick an answer to see if it is right. You can try as many times as you like. These are for practice: the final test has different questions.

1. 1.What did Anscombe's quartet show?

   Correlation proves causationVery different datasets can share the same summary statisticsThe median is always betterSmall samples are fine
2. 2.For skewed data like income, the better 'typical' value is usually...

   the meanthe medianthe maximumthe range
3. 3.You find an outlier. What should you do?

   Delete it quietlyCheck where it came from, apply a rule decided in advance, and report itDouble itIgnore the whole dataset
4. 4.Two groups differ by 2 points. When is this most likely to be meaningful?

   When values vary by about 50 pointsWhen values vary by about 1 pointNeverAlways