Python Institute PCED-30-01 Practice Exams
Last updated on Oct 22,2026- Exam Code: PCED-30-01
- Exam Name: Certified Entry-Level Data Analyst with Python
- Certification Provider: Python Institute
- Latest update: Oct 22,2026
Question #121
In data analysis, what is the purpose of hypothesis testing?
- A . To visualize data
- B . To summarize data
- C . To test relationships between variables
- D . To clean data
Correct Answer: C
Question #122
Which type of chart is best used to display the distribution of a numerical variable?
- A . Bar chart
- B . Line plot
- C . Histogram
- D . Scatter plot
Correct Answer: C
Question #123
What is the first step in the data acquisition process?
- A . Data cleaning
- B . Data validation
- C . Data collection
- D . Data visualization
Correct Answer: C
Question #124
What is the process of fine-tuning a machine learning model to improve its performance known as?
- A . Model validation
- B . Hyperparameter tuning
- C . Data preprocessing
- D . Feature selection
Correct Answer: B
Question #125
Which of the following data types in Python is mutable?
- A . Tuple
- B . List
- C . String
- D . Dictionary
Correct Answer: B
Question #126
In a line plot, which axis typically represents the independent variable?
- A . X-axis
- B . Y-axis
Correct Answer: A
Question #127
When would you use a t-test in statistical analysis?
- A . When comparing means of two independent groups
- B . When comparing more than two group means
- C . When analyzing correlation between variables
- D . When analyzing categorical data
Correct Answer: A
Question #128
Which of the following is a common step in data pre-processing before performing statistical analysis?
- A . Data cleaning
- B . Data visualization
- C . Model fitting
- D . Hypothesis testing
Correct Answer: A
Question #129
Which of the following techniques can be used for handling missing data in data pre-processing?
- A . Dropping rows with missing values
- B . Filling missing values with the mean or median
- C . Imputing missing values based on other data
- D . All of the above
Correct Answer: D
Question #130
What does the acronym API stand for in the context of data communication?
- A . Application Programming Interface
- B . Advanced Python Interface
- C . Algorithmic Programming Interface
- D . Automated Process Integration
Correct Answer: A