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Data Analysis Flashcards

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

Read the first 7 Data Analysis flashcards as text

  1. A scatterplot shows hours studied vs. test scores for 20 students. The line of best fit is y = 5.2x + 48. What does the slope 5.2 represent?

    Answer: The predicted score increase for each additional hour studied

    The slope represents the predicted change in y for each one-unit increase in x.

  2. A dataset has values: 12, 15, 15, 18, 20, 22, 95. Which measure of center best represents the typical value?

    Answer: Median

    The median is resistant to the outlier 95, making it the best measure of center for skewed data.

  3. A survey of 400 people found that 60% prefer brand A, with a margin of error of ±4%. Which interval most likely contains the true population proportion?

    Answer: 56% to 64%

    Applying ±4% to 60% gives the confidence interval 56% to 64%.

  4. Which correlation coefficient best describes a strong negative linear relationship?

    Answer: r = -0.88

    A value of r = -0.88 indicates a strong negative linear relationship because it is close to -1.

  5. A box plot shows: minimum = 10, Q1 = 25, median = 40, Q3 = 55, maximum = 70. What is the interquartile range (IQR)?

    Answer: 30

    IQR = Q3 − Q1 = 55 − 25 = 30.

  6. A researcher finds a strong positive correlation between shoe size and reading ability in children ages 5–12. What is the most likely explanation?

    Answer: Age is a confounding variable driving both

    Age is a confounding variable; as children grow older, both shoe size and reading ability improve independently.

  7. A frequency table shows 30 students scored 70–79, 50 scored 80–89, and 20 scored 90–99. What percentage of students scored 80 or above?

    Answer: 70%

    Students scoring 80+ = 50 + 20 = 70 out of 100 total = 70%.