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A model achieves 99% accuracy detecting fraud, but only 1% of transactions are actually fraudulent. What metric should you examine next?
Two transactions modify the same record simultaneously and produce inconsistent results. What issue occurred?
What is the output of this code?
x = [1, 2, 3]
y = x y.append(4) print(len(x))
A website loads slowly because it requests 500 small images. What is the main issue?
Why is a model evaluated on data it has never seen before?
A computer has multiple CPU cores, but a program only uses one core. Which change is MOST likely to improve performance?
A developer changes a single function and unexpectedly breaks five unrelated features. Which design issue is MOST likely present?
Which traversal of a Binary Search Tree produces sorted output?
Which metric is most appropriate for evaluating a regression model's performance?
Which browser storage mechanism is automatically sent with HTTP requests?
Which data structure would you choose to implement an autocomplete feature?
