Practice Test Geeks(FAST) Future Aptitude Selection Tool Practice Test
← All FAST Flashcard Decks

Descriptive Statistics Flashcards

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

Read the first 7 Descriptive Statistics flashcards as text

  1. A class interval has lower boundary 20 and upper boundary 30. What is its midpoint (class mark)?

    Answer: 25

    Class mark = (lower boundary + upper boundary) / 2 = (20 + 30) / 2 = 25.

  2. Which statistic is used to determine whether a dataset is more or less spread out than a normal distribution?

    Answer: Kurtosis

    Kurtosis measures the 'tailedness' or peakedness of a distribution relative to a normal distribution.

  3. Ages of participants: 18, 19, 21, 22, 25, 25, 30, 45. The range is:

    Answer: 27

    Range = Maximum − Minimum = 45 − 18 = 27.

  4. A researcher adds 10 to every value in a dataset. Which statistics will change?

    Answer: Mean and median, but not variance

    Adding a constant shifts the entire distribution, changing mean and median, but leaves spread measures (variance, SD) unchanged.

  5. In a dataset with values 5, 10, 15, 20, 25, what is the coefficient of variation?

    Answer: 63%

    Mean = 15; SD = √40 ≈ 7.07; CV = (7.07/15) × 100 ≈ 47%; recalculating: variance = [(100+25+0+25+100)/5] = 50, SD=√50≈7.07, CV≈47%.

  6. Which of the following data visualizations shows individual data points AND their distribution summary?

    Answer: Box-and-whisker plot

    A box-and-whisker plot displays the five-number summary (min, Q1, median, Q3, max), showing the distribution's center, spread, and outliers.

  7. If two datasets have the same mean but different standard deviations, the one with the larger standard deviation has:

    Answer: Greater variability around the mean

    Standard deviation measures how spread out values are around the mean; a larger SD means values are more dispersed.