Analytics / Data Science 201 (ADY201m) 2025 – 400 Free Practice Questions to Pass the Exam

The technique of data visualization and descriptive statistics is particularly effective for assessing data content and quality during the data collection stage. By utilizing visual tools and summary statistics, analysts can quickly identify trends, patterns, and anomalies in the data. This helps in understanding the data's characteristics, such as its distribution, central tendency, variability, and potential outliers.

Data visualization creates visual representations that can highlight discrepancies and help assess whether the data meets certain quality standards. For instance, a histogram can reveal if data is normally distributed or contains skewness, while scatter plots might show coherence between two variables or identify outliers.

Descriptive statistics provides numerical summaries that help in grasping the overall picture of data quality. Metrics like mean, median, mode, range, variance, and standard deviation give insights into the data set's central tendencies and dispersion.

Together, visualization and descriptive statistics are invaluable for initial assessments of completeness, accuracy, and consistency in the data collected, allowing for early interventions if issues are detected. This process is essential for ensuring that the subsequent analysis is based on reliable data.