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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. What does 'ETL' stand for in data engineering?

    Answer: Extract, Transform, Load

    ETL describes moving data from sources into a destination after transformation.

  2. Which value, ranging from -1 to 1, measures linear correlation between two variables?

    Answer: Pearson correlation coefficient

    The Pearson coefficient quantifies linear correlation between -1 and 1.

  3. In hypothesis testing, what does a small p-value typically suggest?

    Answer: Strong evidence against the null hypothesis

    A small p-value indicates results are unlikely under the null hypothesis.

  4. Which visualization library is most associated with statistical plotting in Python and is built on Matplotlib?

    Answer: Seaborn

    Seaborn builds on Matplotlib to create attractive statistical graphics.

  5. What is a row in a relational database table also called?

    Answer: Record

    A row representing a single data entry is called a record.

  6. Which sampling method gives every member of a population an equal chance of selection?

    Answer: Simple random sampling

    Simple random sampling ensures equal probability for all members.

  7. What does a histogram primarily display?

    Answer: The distribution of a single numeric variable

    A histogram shows the frequency distribution of a numeric variable using bins.