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Evaluation type: eval interval
Evaluation type: eval interval

Everything you need to know about the evaluation type: eval interval

Updated over a week ago

This evaluation type checks whether the interval provided by the student is equal to that in the Definition field. The Definition should be specified as a first or second-degree (in)equality in one variable.

Example 1 (first-degree inequality):

Example 2 (second-degree inequality):

If the student answers in the form of a (union of) interval(s), they should use the interval buttons on the function tab of the virtual keyboard. They cannot use buttons on a different tab of the virtual keyboard or brackets on their physical keyboard.

For the union and intersection symbols, students should use the logic tab of the virtual keyboard.

If you want students to only be able to answer with (in)equalities, and not using interval notation, then you can use the evaluation type eval domain. Moreover, this evaluation type should not be confused with the evaluation type eval intervals.

Note that this evaluation type does not have automated feedback. The system does give a warning if the student uses (minus) infinity in a (half-)closed interval. Example:

More on evaluation types

An overview of all evaluation types can be found here (for mathematical answers) and here (for text-based answers). More detail on the different fields of a feedback rule can be found here.

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