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

1. What is the most appropriate way to ensure that a column used as a foreign key contains only valid references to a parent DataFrame in Pandas?

A) Use df.merge() with how='outer'
B) Use df.dropna() on the foreign key column
C) Use df.sort_values() to sort both columns before merging
D) Use .isin() to compare the foreign key column against the parent key column

2. In a scatter plot showing the relationship between advertising spend and sales revenue, the points form a tight upward-sloping pattern. What conclusion can be drawn?

A) Advertising has no effect on sales
B) The data shows no apparent relationship
C) The correlation is weak and likely negative
D) There is a strong positive correlation

3. Which type of chart is most appropriate when comparing the distribution of a numerical variable across multiple categories?

A) Pie chart
B) Line chart
C) Box plot
D) Scatter plot

4. Which techniques are most effective when designing reusable and testable functions in Python?
(Choose two)

A) Use of default parameters
B) Returning print statements instead of values
C) Creating large monolithic functions
D) Avoiding external state or side effects

5. Which transformation method adjusts the mean of the dataset to 0 and the standard deviation to 1?

A) Min-max normalization
B) Z-score normalization
C) Log transformation
D) One-hot encoding

Solutions: