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Fundamentals of Data Analytics Flashcards

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

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  1. What is a 'null value' in a dataset?

    Answer: A missing or unknown value

    A null represents missing or unknown data, which is distinct from zero.

  2. Which sampling method gives every member of a population an equal chance of selection?

    Answer: Random sampling

    Random sampling ensures each member has an equal probability of being chosen.

  3. A correlation coefficient of -0.9 indicates:

    Answer: A strong negative relationship

    A value near -1 indicates a strong inverse relationship between variables.

  4. What does 'ETL' stand for in data processing?

    Answer: Extract, Transform, Load

    ETL means Extract, Transform, Load — the process of moving data into a warehouse.

  5. Which data type would 'customer satisfaction rated 1 to 5' represent?

    Answer: Ordinal

    Ordinal data has a meaningful order but no consistent interval between ranks.

  6. The purpose of a data dictionary is to:

    Answer: Define fields, types, and meanings of data

    A data dictionary documents field names, data types, and their meanings.

  7. Which visualization best reveals the relationship between two continuous variables?

    Answer: Scatter plot

    A scatter plot plots two continuous variables to reveal correlation or patterns.