CompTIA CompTIA Certifications DA0-001 Questions & Answers

• Question 1:

  Which of the following data manipulation techniques is an example of a logical function?

  A. WHERE

  B. AGGREGATE

  C. BOOLEAN

  D. IF

  Correct Answer: D

  Explanation: This is because an IF function is a type of logical function that returns a value based on a condition or a set of conditions. An IF function can be used to manipulate data by applying different actions or calculations depending on

  whether the condition is true or false. For example, an IF function in Excel that can achieve this is:

  =IF (condition, value_if_true, value_if_false)

  The other data manipulation techniques are not examples of logical functions. Here is why:

  WHERE is a type of clause that filters data based on a condition or a set of conditions. A WHERE clause can be used to manipulate data by selecting only the rows that satisfy the condition(s). For example, a WHERE clause in SQL that can

  achieve this is:

  

  AGGREGATE is a type of function that performs a calculation on a group of values, such as sum, average, count, etc. An AGGREGATE function can be used to manipulate data by summarizing or aggregating the values in a column or a table. For example, an AGGREGATE function in SQL that can achieve this is:

  

  BOOLEAN is a type of data type that represents two possible values: true or false. A BOOLEAN data type can be used to manipulate data by storing or returning logical values based on a condition or a set of conditions. For example, a BOOLEAN data type in Python that can achieve this is:

  

• Question 2:

  Which of the following actions should be taken when transmitting data to mitigate the chance of a data leak occurring? (Choose two.)

  A. Data identification

  B. Data processing

  C. Data Reporting

  D. Data encryption

  E. Data masking

  F. Fata removal

  Correct Answer: DE

  Explanation: Data encryption and data masking are two actions that can be taken when transmitting data to mitigate the chance of a data leak occurring. Data encryption means transforming data into an unreadable format that can only be decrypted with a key. Data masking means hiding or replacing sensitive data with fictitious or anonymized data. Both methods protect the confidentiality and integrity of the data in transit. References: CompTIA Data+ Certification Exam Objectives, page 13

• Question 3:

  Andy is a pricing analyst for a retailer. Using a hypothesis test, he wants to assess whether people who receive electronic coupons spend more on average.

  What should Andy's null hypothesis be?

  A. People who receive electronic coupons spend more on average.

  B. People who receive electronic coupons spend less on average.

  C. People who receive electronic coupons do not spend more on average.

  D. People who do not receive electronic coupons spend more on average.

  Correct Answer: C

  The null hypothesis presumes the status quo. Andy is testing whether or not people who receive an electronic coupon spend more on average, so, the null hypothesis states that people who receive the coupon do spend more on average.

• Question 4:

  Samantha needs to share a list of her organization's top 50 customers with the VP of sales.

  She would like to include the name of the customer, the business they represent, their contact information, and their total sales over the past year. The VP does not have any specialized analytics skills or software but would like to make some personal notes on the dataset.

  What would be the best tool for Samantha to use to share this information?

  A. Power BI.

  B. Microsoft Excel.

  C. Minitab.

  D. SAS.

  Correct Answer: B

  Microsoft Excel.

  This scenario presents a very simple use case where the business leader needs a dataset in an easy-to-access form and will not be performing any detailed analysis. A simple spreadsheet, such as Microsoft Excel, would be the best tool for

  this job. There is no need to use a statistical analysis package, such as SAS or Minitab, as this would likely confuse the VP without adding any value. The same is true of an integrated analytics suite, such as Power BI.

• Question 5:

  Given the diagram below:

  

  Which of the following data schemas shown?

  A. Key-value pairs

  B. Online transactional processing

  C. Data Lake

  D. Relational database

  Correct Answer: D

  A relational database is a type of database that organizes data into tables, where each table has a fixed number of columns and a variable number of rows. Each row in a table represents a record or an entity, and each column represents an attribute or a property of that entity. The tables are linked by common fields, called keys, which enable the database to establish relationships between the data. A relational database schema is a diagram that shows the structure and organization of the tables, columns, keys, and constraints in a relational database. The diagram given in the question is an example of a relational database schema, as it shows two tables: "Runs" and "Experiments", with their respective columns, data types, and primary keys. The "Runs" table also has a foreign key that references the "ExperimentId" column in the "Experiments" table, indicating a relationship between the two tables. Therefore, the correct answer is D. References: What is a database schema? | IBM, Database Schema - Javatpoint

• Question 6:

  Which of the following best describes a business analytics tool with interactive visualization and business capabilities and an interface that is simple enough for end users to create their own reports and dashboards?

  A. Python

  B. R

  C. Microsoft Power Bl

  D. SAS

  Correct Answer: C

  The best answer is C. Microsoft Power BI. Microsoft Power BI is a business analytics and business intelligence service by Microsoft. It aims to provide interactive visualizations and business intelligence capabilities with an interface simple enough for end users to create their own reports and dashboards. Power BI can connect to multiple data sources, clean and transform data, create custom calculations, and visualize data through charts, graphs, and tables. Power BI can be accessed through a web browser, mobile device, or desktop application and integrated with other Microsoft tools like Excel and SharePoint12 Python is not correct, because Python is a general-purpose programming language that can be used for various applications, including data analysis and visualization. However, Python is not a dedicated business analytics tool, and it requires coding or programming skills to create reports and dashboards. R is not correct, because R is a programming language and software environment for statistical computing and graphics. R can be used for data analysis and visualization, but it is not a specialized business analytics tool, and it requires coding or programming skills to create reports and dashboards. SAS is not correct, because SAS is a software suite for advanced analytics, business intelligence, data management, and predictive analytics. SAS can provide interactive visualizations and business capabilities, but it does not have an interface that is simple enough for end users to create their own reports and dashboards. SAS also requires coding or programming skills to use its features.

• Question 7:

  An analyst is currently working on a ticket for revamping a company-wide dashboard that has been in use for five years. Which of the following should be the first step in the development process?

  A. Talk to the group that made the request to determine the desired goal.

  B. Make changes to a frequently used report that is already in production.

  C. Build an additional dashboard with fewer views that are tailored toward each specific team.

  D. Develop a more streanMined dashboard to roll out by the next delivery date.

  Correct Answer: A

  Explanation: The first step in the development process of revamping a company-wide dashboard should be to talk to the group that made the request to determine the desired goal. This would help to understand the needs, expectations, and preferences of the stakeholders, as well as the scope, purpose, and objectives of the project. Talking to the group that made the request would also help to establish a clear communication channel, build rapport and trust, and solicit feedback and suggestions.

• Question 8:

  Which of the following data types would a telephone number formatted as XXX-XXX-XXXX be considered?

  A. Numeric

  B. Date

  C. Float

  D. Text

  Correct Answer: D

  A telephone number formatted as XXX-XXX-XXXX would be considered a text data type, as it is composed of alphanumeric characters and symbols. A numeric data type is composed of only numbers, such as integers or decimals. A date data type is composed of values that represent dates or times, such as YYYY-MM-DD or HH:MM:SS. A float data type is composed of numbers with fractional parts, such as 3.14 or 0.5. Reference: Guide to CompTIA Data+ and Practice Questions - Pass Your Cert

• Question 9:

  A junior web developer is developing a new application where users can upload short videos. The first task is to create a homepage that shows the headline "Upload Your Short Videos" and a clickable button that says "upload now".

  Which of the following HTML commands would help the developer to complete the task successfully?

  A. < span >Upload Your Short Videos< /span >< button >upload now< /button >

  B. < p >Upload Your Short Videos< /p >< p >upload now< /p >

  C. < hl >Upload Your Short Videos< /h1 >< button >upload now< /button >

  D. < hl >Upload Your Short Videos< /h1 >< hl >upload now< /h1 >

  Correct Answer: C

  The HTML commands that would help the developer to complete the task successfully are

  Upload Your Short Videos

  and upload now. The

  tag defines a heading level 1, which is the largest and most important heading on a webpage. The tag defines a clickable button that can perform some action when clicked. The other options are not suitable for the task, as they either use the wrong tags or do not create a clickable button. The tag defines a section of text with no specific meaning or formatting. The

  tag defines a paragraph of text. The tag does not exist in HTML. Reference: HTML Tags - W3Schools

• Question 10:

  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.)

  A. Data accuracy

  B. Data constraints

  C. Data attribute limitations

  D. Data bias

  E. Data consistency

  F. Data manipulation

  Correct Answer: AE

  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.