Practice Test GeeksData Science Practice Test
← All Data Science Flashcard Decks

Statistical Concepts and Analysis 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 Statistical Concepts and Analysis flashcards as text

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

    Answer: Simple random sampling

    Simple random sampling ensures each unit has an identical probability of being chosen.

  2. The standard deviation measures:

    Answer: The typical spread of values around the mean

    Standard deviation quantifies average dispersion of data points from the mean.

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

    Answer: 68%

    The empirical rule states about 68% of values lie within ±1 standard deviation.

  4. Which is an example of a categorical (nominal) variable?

    Answer: Eye color

    Eye color labels categories with no inherent numeric order, making it nominal.

  5. If two events are mutually exclusive, then:

    Answer: They cannot occur at the same time

    Mutually exclusive events have no overlap, so they cannot both happen simultaneously.

  6. What does R-squared represent in a regression model?

    Answer: The proportion of variance in the outcome explained by predictors

    R-squared is the fraction of the dependent variable's variance accounted for by the model.

  7. A boxplot's interquartile range (IQR) spans which values?

    Answer: The 25th to the 75th percentile

    The IQR is the distance between Q1 (25th) and Q3 (75th) percentiles, covering the middle 50%.

Statistical Concepts and Analysis Flashcards — Data Science Study Cards with Answers