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
What does the coefficient of determination (R-squared) measure in statistical analysis?
- A . The strength of the linear relationship between two variables
- B . The probability of rejecting the null hypothesis
- C . The variability in the dependent variable explained by the independent variable
- D . The level of significance in a hypothesis test
Which of the following is a common technique used for data imputation in missing data?
- A . Mean substitution
- B . Last observation carried forward
- C . Multiple imputation
- D . Complete case analysis
What does the ‘len()’ function in Python do?
- A . Returns the number of elements in a list
- B . Returns the length of a string
- C . Computes the sum of a list of numbers
- D . Sorts a list in ascending order
Which technique is commonly used in machine learning for splitting a dataset into training and testing sets?
- A . Randomization
- B . Normalization
- C . One-hot encoding
- D . Train-test split
In data visualization, what does the term "data storytelling" refer to?
- A . Presenting data in a visually appealing way
- B . Creating a narrative around the data to convey insights
- C . Using bright colors in graphs and charts
- D . Simply displaying data without any context
Which type of model is commonly used for anomaly detection in data analysis?
- A . Neural network
- B . Support Vector Machine
- C . Random forest
- D . Isolation Forest
What is the purpose of data normalization in data pre-processing?
- A . To replace missing values with appropriate data
- B . To scale numerical features to a standard range
- C . To handle categorical variables in a dataset
- D . To filter noise from the data
In data communication and visualization, what does the term "dashboard" refer to?
- A . A collection of data that is difficult to interpret
- B . A visual display of the most important information for a specific audience
- C . A tool used to hide data from stakeholders
- D . A type of data preprocessing technique
Which of the following is NOT a commonly used method for data pre-processing?
- A . Data cleaning
- B . Data integration
- C . Data visualization
- D . Data transformation
What is overfitting in the context of machine learning?
- A . Underfitting the data
- B . Creating a model that is too simple
- C . Creating a model that generalizes well
- D . Creating a model that performs well on training data but poorly on test data