Practice Test GeeksDSE - Data Science Practice Test
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Basic Flashcards

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

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  1. Which measure of central tendency is most resistant to outliers?

    Answer: Median

    The median is resistant to outliers because it depends only on rank order, not actual values.

  2. In a normal distribution, approximately what percentage of data falls within one standard deviation of the mean?

    Answer: 68%

    The empirical rule states that ~68% of data falls within ±1 standard deviation in a normal distribution.

  3. What is the primary purpose of data normalization?

    Answer: Scale features to a common range

    Normalization scales features to a common range (e.g., 0–1) so no single feature dominates due to magnitude.

  4. Which Python library is most commonly used for data manipulation and analysis?

    Answer: Pandas

    Pandas provides DataFrames and Series structures purpose-built for data cleaning and analysis.

  5. What does 'variance' measure in a dataset?

    Answer: The average squared deviation from the mean

    Variance measures how spread out data points are by averaging their squared deviations from the mean.

  6. A dataset with a long right tail is described as:

    Answer: Positively skewed

    A long right tail indicates positive (right) skewness, meaning the tail extends toward higher values.

  7. Which file format is most commonly used to exchange tabular data between systems?

    Answer: CSV

    CSV (Comma-Separated Values) is the most universally supported format for simple tabular data exchange.