How long is a piece of string?

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This is a crowd experiment to illustrate uncertainty in the estimation of energy savings. We're going to imagine that the length of string A corresponds to energy consumption before an energy-saving measure, and the length of string B corresponds to consumption afterwards.

We can subtract length B from length A to estimate how much was cut off (i.e. how much energy was saved).

A hundred people will have a hundred different answers for A and B and the variation we see in people's answers tells us how much uncertainty there is in any individual measurement. But how does that affect our confidence in the estimated savings? We'll see...

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You will be taking measurements from the picture above. Please measure in millimetres and enter the numerical value only.

First to calibrate your answer, measure the length of the CALIBRATION SCALE. How long is it? *

How long is STRING A? *

How long is STRING B? *

Thanks...

Your response will be pooled with all the others and we'll use the results to show how uncertainty in 'before' and 'after' measurements affects our estimate of the difference. We'll email the results to you.

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