Practice Test GeeksDA - Data Analyst Practice Test
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Statistical Analysis Flashcards

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

Read the first 6 Statistical Analysis flashcards as text

  1. What is the interquartile range (IQR)?

    Answer: The difference between Q3 and Q1

    The IQR is calculated as Q3 minus Q1 and represents the spread of the middle 50% of the data.

  2. What type of analysis examines the relationship between a dependent variable and one or more independent variables?

    Answer: Regression analysis

    Regression analysis models the relationship between a dependent variable and one or more predictors to explain or predict outcomes.

  3. In a box plot, what does the line inside the box represent?

    Answer: Median

    The line inside the box of a box plot marks the median (Q2), the middle value of the dataset.

  4. What is Type I error in hypothesis testing?

    Answer: Rejecting a true null hypothesis

    A Type I error (false positive) occurs when a true null hypothesis is incorrectly rejected.

  5. Which test is appropriate for comparing proportions between two independent groups?

    Answer: Chi-square test

    The chi-square test of independence is used to determine if there is a significant association between two categorical variables or proportions.

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

    Answer: The proportion of variance in the dependent variable explained by the model

    R-squared (coefficient of determination) indicates how much of the variability in the dependent variable is explained by the independent variables.