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Trivia Flashcards

7 cards from real Data Science practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Trivia flashcards as text

  1. Which file format is widely used for storing nested, hierarchical data in web APIs?

    Answer: JSON

    JSON stores structured, nested data and is common in web APIs.

  2. What is the term for filling in missing data values during preprocessing?

    Answer: Imputation

    Imputation replaces missing values with estimated substitutes.

  3. Which metric measures the proportion of correct predictions out of all predictions?

    Answer: Accuracy

    Accuracy is the ratio of correct predictions to total predictions.

  4. What scaling technique rescales features to a range between 0 and 1?

    Answer: Min-max normalization

    Min-max normalization rescales values into a fixed 0 to 1 range.

  5. Which type of join returns only rows with matching keys in both tables?

    Answer: Inner join

    An inner join returns only the rows present in both tables.

  6. What is the iterative cloud or local environment combining code, output, and notes commonly used by data scientists?

    Answer: Jupyter Notebook

    Jupyter Notebooks let users mix live code, output, and documentation.

  7. Converting categorical variables into binary columns is known as what?

    Answer: One-hot encoding

    One-hot encoding creates a binary column for each category value.