Sampling and hypothesis testing

problem

Chance of That

Age

16 to 18

Challenge level

3 out of 3

What's the chance of a pair of lists of numbers having sample correlation exactly equal to zero?
article
The Surveyor Who Came to Tea

This article discusses how a survey company carries out its surveys and some of the issues involved.
$\nostyle Challenging Data Tasks: The Making of "Where Are You Flying?"$

article
Challenging Data Tasks: The Making of 'where Are You Flying?'

How was the data for this problem compiled? A guided tour through the process.