Some thought on 'Perception of correlation'

[petzi53]

It is a great idea to train the perception of correlation. But maybe we could improve its realization?

For an estimation, without knowing the correct value, students would have to delete the unfinished code part of the exercise chunk. Then run the code for the plot, make their guess, and then write or paste the code again for correlation calculation. This seems laborious.

A simple solution would be to separate these two actions, e.g., either to have two exercise chunks (one for the plot, the other for the calculation) or just to display the plot and only one exercise chunk where students are asked to do the calculation.

There is another possibility to develop an exercise with trial & error using the gradethis package. To see how this feels, I designed a demo. Probably a native speaker should write better feedback messages, and I am not sure if the random praise and encourage messages should be used. But I think that these kinds of exercises would be more challenging and especially more fun.