CompTIA Data+ Certification - (DA0-001) Exam Questions

OBJ 4.1 - These automatic views and visuals are known as hard-coded filters. Hard-coded filters are coded into the view or the visual. These filters are automatically applied and the user does not adjust them. Interactive filters are filters that allow the viewer to adjust a slicer or filter on a dashboard to narrow or expand the data they want to see. A mockup is a rough draft of a dashboard. A wireframe is a series of multiple mockups for multiple screens that are likely connected to a dashboard. It is never too early to plan out what visuals will best represent data to convey a story to the analysis consumer.

OBJ 2.1 - A delta load is the act of loading new data into a data system and updating any existing data that has changed since the last load. A full load is used when loading data into a storage system for the first time. The ELT process is a more modern method of preparing data for data lakes. Data lakes are most often used for unstructured data, which would best store the required video. The ETL process is the most common method used to prepare data for a data warehouse.

OBJ 3.2, 3.3 - This is an example of an r value. Pearson’s correlation coefficient is a calculation used to measure a linear relationship between data points and returns an r value that is plus or minus 1 to determine the strength of the relationship. An r value that is close to 1 indicates a strong correlation between values and a value of or close to 0 means indicates that there is no correlation. Correlation is the statistical association between two or more equal variables. Correlation does not tell an analyst that a variable influences another, but it does indicate that if one variable changes, the other variable changes as well. A causal relationship proves that a variable has an effect on another variable.

OBJ 4.4: Angel should use a dot map. A dot map uses circles to represent specific spots on a map. The size of the circle can indicate another dimension of the data such as the amount of money invested. A treemap is used primarily for displaying a hierarchy. It shows the hierarchy through a set of nested images.  A layered map combines a dot map and a filled map to show additional dimensions of data.

OBJ 5.1, 5.2 - This is known as transparency. Transparency ensures all members of an organization have access to data governance policies and understand their function. Accountability establishes measures to ensure governance policies are followed. Standardization means data is consistently labeled, categorized, and described for use within an organization. Data governance is a framework that covers the technology, people, and processes that help control data within an organization during its different life cycles. This framework is most effective when all departments in an organization are involved and have a stake in proper management.