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We give a data set and ask some open ended questions. Out of 800 applicants, maybe 50 complete the exercise, and then maybe less than 10 we'll want to talk to based on what they sent. I spent maybe 5 hours on the dataset when I was interviewing for the position myself.

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Wow, only 6% complete the task? I am testing my luck here, but do you have any sample/link to a data-set or questions you have asked before, or maybe a link to something similar to what you have asked?

The dataset is private but the general gist is its like 100,000 rows with conversion and revenue data with time and 2 other dimensions. There are some outliers (clearly errors) in the data and strong seasonality differences in some dimensions, and data sparsity in others. The applicant isn't told about these, but we look for them to find it in their analysis and control for it in a predictive model they are asked to build based on the data.

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