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Guide and features
Guide and features
Science, Technology, Engineering and Mathematics
Featured Early Years Foundation Stage; US Kindergarten
Featured UK Key Stage 1&2; US Grades 1-4
Featured UK Key Stage 3-5; US Grades 5-12
Featured UK Key Stage 1, US Grade 1 & 2
Featured UK Key Stage 2; US Grade 3 & 4
Featured UK Key Stages 3 & 4; US Grade 5-10
Featured UK Key Stage 4 & 5; US Grade 11 & 12
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Very Old Man
Is the age of this very old man statistically believable?
Reaction Timer Timer
problem introduces this interactivity which measures the amount of time taken to react to a shape appearing on-screen:
Open animation in new window
Open previous flash version in a new window
In this interactivity it is known that once a shape disappears an internal timer begins. The time until the appearance of the next shape is determined randomly through a clear, well-defined statistical process which is unknown to us. From the moment that this next shape disappears the timer resets and starts again; the random process then again determines the time until the appearence of the next shape. Familiarise yourself with the interactivity before considering this question:
Upon each shape disappearing there is a delay of a random length until the appearence of the next shape. How might you design an experiment to determine the nature of the random process giving rise to the delay?
Once you have designed the experiment, perform it and analyse the data. Can you produce a clear hypothesis as to the random process giving rise to the delay?
Probability distributions, expectation and variance
Maths Supporting SET
Sampling and hypothesis tests
Meet the team
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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