Data Science quiz

More questions about Data Science

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   What statistical relationship measures association between two variables?

   Answer: Correlation

   Why: Classic spurious correlations include the famous link between ice cream sales and shark attacks, both driven by warm weather.

2. 2 Medium

   In high dimensions, where does nearly all of a hypercube's volume lie?

   Answer: In the corners

   Why: In ten dimensions, an inscribed hypersphere occupies less than 0.25% of the surrounding hypercube's volume.

3. 3 Hard

   What happens to distances between data points as dimensions increase?

   Answer: Distances between all points become nearly equal

   Why: Because volume grows exponentially with dimensions, high-dimensional spaces are mostly empty, making nearest-neighbor search far less discriminative.

4. 4 Easy

   Which probability distribution has a symmetrical bell-shaped curve?

   Answer: Normal distribution

   Why: In a normal distribution, roughly 68% of all data points fall within one standard deviation of the central mean.

5. 5 Medium

   What problem causes high bias in a machine learning model?

   Answer: Underfitting

   Why: Underfitting happens when an oversimplified model misses underlying patterns, hurting both training and test scores.

6. 6 Hard

   Which metric equals the maximum single-coordinate difference?

   Answer: Chebyshev distance

   Why: Because it tracks only the greatest single axis difference, Chebyshev distance matches how a chess king moves across a board.