Sampling and hypothesis testing

problem
Chance of that

Age

16 to 18

Challenge level

What's the chance of a pair of lists of numbers having sample correlation exactly equal to zero?
problem
A well-stirred sample

Age

16 to 18

Challenge level

Typical survey sample sizes are about 1000 people. Why is this?
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.
problem
Sleep: the silent killer

Age

16 to 18

Challenge level

"Too much sleep is deadly" proclaimed the newspaper headline. Is this true?
list
Statistics - maths of real life

Age

14 to 18

Challenge level

This pilot collection of resources is designed to introduce key statistical ideas and help students to deepen their understanding.
problem
Powerful hypothesis testing

Age

16 to 18

Challenge level

How effective are hypothesis tests at showing that our null hypothesis is wrong?
problem
Hypothetical shorts

Age

16 to 18

Challenge level

Some short statements about hypothesis testing: are they true, false, or somewhere in between?
problem
Chi-squared faker

Age

16 to 18

Challenge level

How would you massage the data in this Chi-squared test to both accept and reject the hypothesis?
problem
Reaction timer timer

Age

16 to 18

Challenge level

How can you time the reaction timer?