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And if you pick every item correctly, you're eligible to win a $100,000 prize.
If they are located above the item location, the likelihood of answering the item correctly increases.
Conversely, if they are located below the item, the likelihood of answering the item correctly decreases.
One is the difficulty index which is the proportion of test takers who answered the question item correctly.
A candidate located at the same location as an item has a 50% probability of answering the item correctly.
For instance, if b = 0.2, about 50% of test takers with proficiency = 0.2 would answer the item correctly.
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Contestants who answer all items correctly are ranked by speed of response: the fastest are selected to be on-air finalists.
On average, students answered 13 of 30 items correctly (SD = 5.01).
In GPAM-WATA, when examinees fail to answer items correctly, they obtain instructional prompts (IPs) in a graduated way.
However, students in the module courses improved on items aligned with those concepts, while fewer students in control courses answered those items correctly.
That's one reason why delivery service Instacart put their in-store shoppers on payroll – so they can be properly trained on how to pick items correctly.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com