CompTIA Data+ Certification DA0-001 Exam Practice Test

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Total 363 questions
Question 1

An analyst is building a new dashboard for a user. After an initial conversation with the user. the analyst created a mock-up of the dashboard. Which of the following best explains why the analyst created the mock-up?



Answer : C

Answer : C . To confirm important details before dashboard development begins.

A dashboard mockup is a prototype of a finished dashboard directly in the product. It is a way to visualize the layout, design, and functionality of the dashboard before it is built with real data and code. A dashboard mockup can help the analyst to confirm important details with the user, such as the business objectives, the key performance indicators, the data sources, the filters, the charts, and the interactivity.By creating a dashboard mockup, the analyst can get immediate feedback and validation from the user,and avoid wasting time and resources on developing a dashboard that does not meet the user's expectations or needs1.


Question 2

Different people manually type a series of handwritten surveys into an online database. Which of the following issues will MOST likely arise with this data? (Choose two.)



Answer : A, E

Data accuracy refers to the extent to which the data is correct, reliable, and free of errors. When different people manually type a series of handwritten surveys into an online database, there is a high chance of human error, such as typos, misinterpretations, omissions, or duplications. These errors can affect the quality and validity of the data and lead to incorrect or misleading analysis and decisions.

Data consistency refers to the extent to which the data is uniform and compatible across different sources, formats, and systems. When different people manually type a series of handwritten surveys into an online database, there is a high chance of inconsistency, such as different spellings, abbreviations, formats, or standards. These inconsistencies can affect the integration and comparison of the data and lead to confusion or conflicts.

Therefore, to ensure data quality, it is important to have clear and consistent rules and procedures for data entry, validation, and verification. It is also advisable to use automated tools or methods to reduce human error and inconsistency.


Question 3

A military commander would like to see the health scorecards of the troops daily and filter them based on gender and rank. Considering this data is PHI, which of the following would be the best way for the commander to view the information?



Answer : B

A password-protected dashboard is a type of web-based application that can display the health scorecards of the troops in a secure and interactive way. A password-protected dashboard can provide the following benefits for the commander:

It can protect the PHI data from unauthorized access or disclosure by requiring a valid username and password to log in.This can ensure that only the commander and other authorized personnel can view the information12

It can allow the commander to filter the data based on gender and rank by using drop-down menus, sliders, checkboxes, or other controls.This can enable the commander to customize the view and focus on the relevant data13

It can update the data daily by connecting to a data source that refreshes automatically or on demand.This can ensure that the commander always sees the latest and most accurate information14

It can present the data in a visual and intuitive way by using charts, graphs, tables, or other elements.This can help the commander to understand and analyze the data more easily and effectively1


Question 4

Which of the following describes the use of a representative amount of data from a main repository?



Answer : D

Sampling refers to the process of selecting a representative subset of data from a larger data set or repository. This technique is used when it is impractical or unnecessary to analyze the entire set of data.A representative sample should accurately reflect the characteristics of the larger population, allowing for analysis and inference about the population as a whole12.

Observation (A) generally refers to the act of monitoring or recording data. Delta load (B) is a term used in data warehousing to describe the process of loading only the changes since the last data extraction, rather than the entire data set. Web scraping is the process of extracting data from websites.


Understanding the importance of data sampling1.

The concept of a representative sample in statistics2.

Data repository management and usage3.

Benefits and methods of data sampling4.

Question 5

A business intelligence team wants to create a new dashboard in order to solve a problem statement. Which of the following is the correct order of steps the team should take?



Answer : C


Question 6

Which of the following best describes a 95% confidence interval?



Answer : C

Comprehensive and Detailed In-Depth

A95% confidence intervalis a statistical range, derived from sample data, that is likely to contain the true population mean. It reflects the degree of uncertainty or certainty in a sampling method.

Option C:A set of ranges contains the population mean with 95% certainty.

Rationale:This statement accurately describes a 95% confidence interval. It means that if we were to take 100 different samples and compute a confidence interval for each sample, we would expect about 95 of the intervals to contain the true population mean.

Option A:There is a 95% probability that a sample is within one standard deviation of the mean.

Rationale:This statement confuses confidence intervals with standard deviation. A 95% confidence interval pertains to the range within which the population mean is expected to lie, not the dispersion of individual sample points around the mean.

Option B:A stated range may contain 95% of the population mean, 95% of the time.

Rationale:This statement is incorrect because the population mean is a single value, not something that can be 95%


Question 7

You would like to measure how well an organization is achieving its goals.

What type of analysis should you perform?



Answer : A

Performance analysis is the technique of studying or comparing the performance of a specific situation in contrast to the aim and yet executed. In Human Resources, performance analysis can help to review an employee's contribution towards a project or assignment, which they allotted him or her.


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