Pass Your CompTIA Data+ DA0-001 Exam on May 20, 2024 with 215 Questions
DA0-001 Free Exam Study Guide! (Updated 215 Questions)
NEW QUESTION # 114
What technique can you use to predict one value from another using a linear relationship?
- A. Regression.
- B. Correlation.
- C. Chi-square.
- D. Hypothesis testing.
Answer: A
NEW QUESTION # 115
While reviewing survey data, a research analyst notices data is missing from all the responses to a single question. Which of the following methods would BEST address this issue?
- A. Replace redundant data.
- B. Replace missing data.
- C. Remove invalid data.
- D. Remove duplicate data.
Answer: B
NEW QUESTION # 116
According to the empirical rule, what percent of thee values in a sample fall within three standard deviations of the mean in a normal distribution?
- A. 68%
- B. 95%
- C. 90%
- D. 99.70%
Answer: D
Explanation:
According to the empirical rule, 68% of values are within one standard deviation, 95% are within two standard deviations, and 99.7% are within three standard deviations.
NEW QUESTION # 117
What is the final stage of the data lifecycle?
- A. Archive.
- B. Store.
- C. Destroy.
- D. Share.
Answer: C
Explanation:
Destroying data means it can no longer be read by an operating system or application. Merely deleting a file is insufficient. When you delete a file on an electronic device, you may not be able to see it any longer, but the information is still stored on the device's hard drive or memory chip.
When the time comes that you no longer need a document or set of documents, you should destroy them. Providing that they don't relate to company information, clients or employees, you are able to destroy them as frequently as you please.
NEW QUESTION # 118
A user receives a large custom report to track company sales across various date ranges. The user then completes a series of manual calculations for each date range. Which of the following should an analyst suggest so the user has a dynamic, seamless experience?
- A. Create a dashboard with a date range picker and calculations built in.
- B. Create multiple reports, one for each needed date range.
- C. Add macros to the report to speed up the filtering and calculations process.
- D. Build calculations into the report so they are done automatically.
Answer: D
NEW QUESTION # 119
Given the diagram below:
Which of the following data schemas shown?
- A. Data lake
- B. Relational database
- C. Key-value pairs
- D. Online transactional processing
Answer: B
NEW QUESTION # 120
A company's human resources department has asked a data analyst to categorize the income of all employees into five salary bands:
Which of the following types of functions would be the most appropriate to use?
- A. Statistical
- B. Aggregate
- C. Logical
- D. Mathematical
Answer: C
Explanation:
Explanation
Short explanation: Logical functions are the most appropriate to use for categorizing data into bands, because they allow the data analyst to apply conditional statements and criteria to the data values. For example, the IF function can be used to assign a band name based on whether a value meets a certain condition or not. Other logical functions that can be useful for categorizing data are AND, OR, NOT, and IFERROR12
NEW QUESTION # 121
Which of the following contains alphanumeric values?
- A. 13.6
- B. 0
- C. 10.1E
- D. A3J7
Answer: D
NEW QUESTION # 122
A data analyst for a media company needs to determine the most popular movie genre. Given the table below:
Which of the following must be done to the Genre column before this task can be completed?
- A. Merge
- B. Delimit
- C. Concatenate
- D. Append
Answer: B
NEW QUESTION # 123
Which of the following can be used to translate data into another form so it can only be read by a user who has a key or a password?
- A. Data transmission.
- B. Data protection.
- C. Data encryption.
- D. Data masking.
Answer: C
NEW QUESTION # 124
Alex wants to use data from his corporate sale, CRM, and shipping systems to try and predict future sales.
Which of the following systems is the most appropriate?
Choose the best answer.
- A. Data mart.
- B. OLTP.
- C. OLAP.
- D. Data Warehouse.
Answer: D
Explanation:
Explanation
Correct answer: C. Data Warehouse.
Data warehouse bring together data from multiple systems used by an organization.
A data mart is too narrow, as Alex needs data from across multiple divisions.
OLAP is a broad term of analytical processing, and OLTP systems are transactional and not ideal for this task.
NEW QUESTION # 125
A database consists of one fact table that is composed of multiple dimensions. Depending on the dimension, each one can be represented by a denormalized table or multiple normalized tables. This structure is an example of a:
- A. snowflake schema.
- B. transactional schema.
- C. non-relational schema.
- D. star schema.
Answer: D
Explanation:
Explanation
star schema is a type of database schema that consists of one fact table that is composed of multiple dimensions. A fact table contains quantitative measures or facts that are related to a specific event or transaction. A dimension table contains descriptive attributes or dimensions that provide context for the facts.
A star schema is called so because it resembles a star, with the fact table at the center and the dimension tables radiating from it. A star schema is a type of dimensional schema, which is designed for data warehousing and analytical purposes. Other types of dimensional schemas include snowflake schema and galaxy schema. A snowflake schema is similar to a star schema, except that some or all of the dimension tables are normalized into multiple tables. A galaxy schema consists of multiple fact tables that share some common dimension tables. A transactional schema is a type of database schema that is designed for operational purposes, such as recording day-to-day transactions and activities. A transactional schema is usually normalized to reduce data redundancy and improve data integrity. A non-relational schema is a type of database schema that does not follow the relational model, which organizes data into tables with rows and columns. A non-relational schema can store data in various formats, such as documents, graphs, key-value pairs, etc.
NEW QUESTION # 126
Which of the following is an example of a discrete variable?
- A. The number of people in an office
- B. The time to complete a task
- C. The temperature of a hot tub
- D. The height of a horse
Answer: A
Explanation:
Explanation
A discrete variable is a variable that can only take on a finite number of values, such as integers or categories.
The number of people in an office is an example of a discrete variable, as it can only be a whole number. The temperature of a hot tub, the height of a horse, and the time to complete a task are examples of continuous variables, as they can take on any value within a range. Reference: CompTIA Data+ (DA0-001) Practice Certification Exams | Udemy
NEW QUESTION # 127
Which of the following data sampling methods involves dividing a population into subgroups by similar characteristics?
- A. Convenience
- B. Stratified
- C. Simple random
- D. Systematic
Answer: B
Explanation:
Explanation
Stratified sampling is a data sampling method that involves dividing a population into subgroups by similar characteristics, such as age, gender, income, etc. Then, a simple random sample is drawn from each subgroup.
This method ensures that each subgroup is adequately represented in the sample and reduces the sampling error. References: CompTIA Data+ Certification Exam Objectives, page 11.
NEW QUESTION # 128
Which action is mandated by the Gramm-Leach-Bliley Act (GLBA) Safeguards Rule?
- A. The distinguishing between consumers and customers.
- B. The disclosure of information sharing practices.
- C. The provision of a privacy notice to consumers.
- D. The development of written information security policy.
Answer: D
NEW QUESTION # 129
A data analyst is asked to create a sales report for the second-quarter 2020 board meeting, which will include a review of the business's performance through the second quarter. The board meeting will be held on July 15,
2020, after the numbers are finalized. Which of the following report types should the data analyst create?
- A. Dynamic
- B. Self-service
- C. Static
- D. Real-time
Answer: C
Explanation:
Explanation
A dynamic report is a type of report that shows data that changes or updates automatically based on certain criteria or parameters. A dynamic report can allow users to interact with the data, filter it, drill down into it, or visualize it in different ways. A dynamic report is suitable for situations where the data changes frequently or where real-time or near-real-time data is needed for decision making or analysis. In this case, the data analyst is asked to create a sales report for the second-quarter 2020 board meeting, which will include a review of the business's performance through the second quarter. The board meeting will be held on July 15, 2020, after the numbers are finalized. This means that the data analyst does not need to show real-time or dynamic data, but rather a fixed and accurate view of the sales data for the second quarter. Therefore, a static report would be the best way to meet this stakeholder requirement. Therefore, the correct answer is A. References: [What are Dynamic Reports? | Sisense], Static vs Dynamic Reports - What's The Difference? | datapine
NEW QUESTION # 130
How many variables may be shown in a simple pie chart?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION # 131
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