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
Which of the following libraries in Python is commonly used for data visualization?
- A . numpy
- B . pandas
- C . matplotlib
- D . scikit-learn
In Python, which keyword is used to define a function?
- A . def
- B . func
- C . define
- D . function
What does the coefficient of determination (R-squared) represent in regression analysis?
- A . The proportion of the variance in the dependent variable explained by the independent variables
- B . The confidence level of the regression model
- C . The correlation between variables
- D . The standard error of the regression
Which of the following techniques can be used for outlier detection in a dataset?
- A . Mean normalization
- B . Principal Component Analysis (PCA)
- C . Z-Score normalization
- D . Boxplot analysis
What is the purpose of feature scaling in data pre-processing?
- A . To create new features from existing ones
- B . To reduce the number of features in a dataset
- C . To eliminate outliers from the data
- D . To standardize the range of features
Which Python function can be used to merge two datasets based on a common column in data pre-processing?
- A . merge()
- B . concat()
- C . join()
- D . append()
Which algorithm is commonly used for clustering in unsupervised learning?
- A . Decision Tree
- B . K-means
- C . Support Vector Machine
- D . Random Forest
In data analysis and modeling, what is the process of identifying and handling missing values in a dataset called?
- A . Data preprocessing
- B . Feature engineering
- C . Outlier detection
- D . Data imputation
Which of the following techniques can be used in data pre-processing to handle missing values?
- A . Removing rows with missing values
- B . Replacing missing values with the mean of the column
- C . Ignoring missing values altogether
- D . Filling missing values with zeros
What is the purpose of a hypothesis test in statistical analysis?
- A . To determine the variance of the data
- B . To calculate the mean of the data
- C . To estimate the effect size of the data
- D . To make an inference about a population parameter using sample data