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

1. What is the correct SQL statement to permanently remove a table named customers from a database?

A) DELETE TABLE customers;
B) REMOVE TABLE customers;
C) TRUNCATE TABLE customers;
D) DROP TABLE customers;

2. Which of the following are true characteristics of bootstrapping in statistics?
(Choose two)

A) It requires a large population sample
B) It assumes a normal distribution
C) It enables confidence interval estimation
D) It uses random sampling with replacement

3. When joining two tables in a relational database using SQL, which clause is used to specify the relationship between their columns?

A) JOIN ON
B) HAVING
C) GROUP BY
D) FROM

4. How would you extract the last three rows of a DataFrame df using position-based indexing?

A) df[-3]
B) df.iloc[-3:]
C) df.tail(3)
D) df.loc[-3:]

5. What does the describe() method in Pandas provide when applied to a numerical DataFrame column?

A) A histogram of the data distribution
B) A normalized version of the data column
C) Basic descriptive statistics such as count, mean, and quartiles
D) Only the standard deviation of the data

Solutions: