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Python Institute Certified Associate Data Analyst with Python (PCAD-31-02) Sample Questions:

1. What may occur if a model is evaluated using the same data it was trained on?

A) Overgeneralization
B) Underfitting
C) Overfitting
D) Data leakage

2. Which method allows you to detect and remove rows with duplicate values across all columns in a Pandas DataFrame?

A) DataFrame.drop_duplicates()
B) DataFrame.unique()
C) DataFrame.remove_duplicates()
D) DataFrame.nunique()

3. What is the function of the melt() operation in Pandas when reshaping wide-format data?

A) Converts column values into rows
B) Sorts the DataFrame based on a column
C) Transposes the DataFrame
D) Combines multiple DataFrames

4. Which characteristics are typically associated with unstructured data formats?
(Choose two)

A) Lacks predefined data schema
B) Requires parsing or transformation before analysis
C) Highly tabular and query-friendly
D) Stored using fixed-width fields and records

5. When creating a line chart with Matplotlib, which function is most appropriate to add a text label at a specific data point?

A) plt.legend()
B) plt.annotate()
C) plt.title()
D) plt.xlabel()

Solutions: