Practice Test GeeksDA - Data Analyst Practice Test
← All DA Flashcard Decks

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 does a p-value less than 0.05 typically indicate in hypothesis testing?

    Answer: The result is statistically significant

    A p-value below 0.05 means there is less than a 5% probability the observed result occurred by chance, so we reject the null hypothesis.

  2. Which measure of central tendency is most affected by extreme outliers?

    Answer: Mean

    The mean sums all values and divides by count, so extreme outliers pull it significantly in their direction.

  3. What is the standard deviation a measure of?

    Answer: Spread or dispersion around the mean

    Standard deviation quantifies how much individual data points deviate from the mean on average.

  4. A data analyst runs a t-test. What is the primary purpose of this test?

    Answer: Compare means of two groups

    A t-test is used to determine whether there is a statistically significant difference between the means of two groups.

  5. What does a correlation coefficient of -0.9 indicate?

    Answer: Strong negative relationship

    A correlation of -0.9 is close to -1, indicating a strong inverse relationship where one variable increases as the other decreases.

  6. Which statistical distribution is symmetric and bell-shaped?

    Answer: Normal distribution

    The normal distribution is symmetric around its mean and produces the familiar bell-shaped curve.