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Statistics Flashcards

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

Read the first 7 Statistics flashcards as text

  1. A fair coin is flipped 10 times. The probability of exactly 3 heads follows which distribution?

    Answer: Binomial

    Fixed trials, constant probability of success, and two outcomes define a binomial distribution.

  2. Which of the following is a characteristic of the normal distribution?

    Answer: Mean, median, and mode are all equal

    The normal distribution is perfectly symmetric, so its mean, median, and mode coincide.

  3. An ANOVA test is used to compare:

    Answer: Three or more group means

    Analysis of Variance (ANOVA) tests whether the means of three or more groups are equal.

  4. Bayes' theorem is used to:

    Answer: Update probability estimates given new evidence

    Bayes' theorem allows you to revise a prior probability in light of new data to get a posterior probability.

  5. Which of the following sampling methods divides the population into subgroups and samples from each?

    Answer: Stratified sampling

    Stratified sampling splits the population into strata (subgroups) and draws random samples from each.

  6. The p-value in a hypothesis test represents:

    Answer: The probability of observing results at least as extreme as the data, assuming H₀ is true

    The p-value is the probability of getting results as extreme as or more extreme than observed, given that H₀ is true.

  7. A box-and-whisker plot displays which five summary statistics?

    Answer: Min, Q1, Median, Q3, Max

    A box plot is built from the five-number summary: minimum, Q1, median, Q3, and maximum.

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