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Could you elaborate on the treatment of categorical data when faced with high cardinality?

Explain the significance of precision and recall in the field of artificial intelligence, and how they can help in improving the accuracy of machine learning models. Also, mention some common limitations and challenges related to the use of these metrics in practice.

Can you demonstrate your technique for turning a biased coin into a fair one?

Can you demonstrate how to create a normal distribution of 1000 data points with a mean of x and variance of y in R, perform a statistical summary, and plot the density? Follow this by executing the same in Python using the Codility platform.

How would you address a 15% decrease in the amount of notifications being sent?

Explain the contrast between L1 and L2 regularization methods used in regression analysis, and when one would be favored over the other.

What are some practical considerations you take into account when selecting between Lasso and Ridge regression models?

Tell me about a time when you helped mentor a new joiner.

Describe a time when you made a decision that didn't work out. What did you learn from this?

Please share an instance when you and your manager disagreed.