Pass CompTIA DA0-001 Actual Free Exam Q&As Updated Dump Oct 23, 2023

Latest DA0-001 Actual Free Exam Updated 215 Questions

NEW QUESTION # 109
What internal document explains privacy responsibilities to employees who will handle personally identifiable information?

• A. Privacy policy
• B. Integrity policy
• C. Acceptable use policy
• D. Security policy

Answer: C

NEW QUESTION # 110
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. OLAP.
• B. Data Warehouse.
• C. OLTP.
• D. Data mart.

Answer: B

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 # 111
Which of the following value is the measure of dispersion "range" between the scores of ten students in a test.
The scores of ten students in a test are 17, 23, 30, 36, 45, 51, 58, 66, 72, 77.

• A. 0
• B. 1
• C. 2
• D. 3

Answer: A

Explanation:
The correct answer is: 60
Range is the interval between the highest and the lowest score.
Range is a measure of variability or scatteredness of the varieties or observations among themselves and does not give an idea about the spread of the observations around some central value.
Symbolically R = Hs - Ls.
Where R = Range; Hs is the 'Highest score' and Ls is the Lowest Score.
The scores of ten students in a test are: 17, 23, 30, 36, 45, 51, 58, 66, 72, 77.
The highest score is 77 and the lowest score is 17.
So the range is the difference between these two scores Range = 77 - 17 = 60

NEW QUESTION # 112
Which of the following database schemas features normalized dimension tables?

• A. Flat
• B. Snowflake
• C. Hierarchical
• D. Star

Answer: B

Explanation:
Explanation
The correct answer is B. Snowflake.
A snowflake schema is a type of database schema that features normalized dimension tables. A database schema is a way of organizing and structuring the data in a database. A dimension table is a table that contains descriptive attributes or characteristics of the data, such as product name, category, color, etc. A normalized table is a table that follows the rules of normalization, which is a process of reducing data redundancy and improving data integrity by organizing the data into smaller and simpler tables12 A snowflake schema is a variation of the star schema, which is another type of database schema that features denormalized dimension tables. A denormalized table is a table that does not follow the rules of normalization, and may contain redundant or duplicated data. A star schema consists of a central fact table that contains quantitative measures or facts, such as sales amount, order quantity, etc., and several dimension tables that are directly connected to the fact table. A snowflake schema differs from a star schema in that the dimension tables are further split into sub-dimension tables, creating a snowflake-like shape13 A snowflake schema has some advantages and disadvantages over a star schema. Some advantages are:
It reduces the storage space required for the dimension tables, as it eliminates the redundant data.
It improves the data quality and consistency, as it avoids the update anomalies that may occur in denormalized tables.
It allows more detailed analysis and queries, as it provides more levels of dimensions.
Some disadvantages are:
It increases the complexity and number of joins required to retrieve the data from multiple tables, which may affect the query performance and speed.
It reduces the readability and simplicity of the schema, as it has more tables and relationships to understand.
It may require more maintenance and administration, as it has more tables to manage and update13

NEW QUESTION # 113
Encryption is a mechanism for protecting data.
When should encryption be applied to data?
Choose the best answer.

• A. When data is at rest.
• B. When data is in transit.
• C. When data is at rest, unless you are using local storage.
• D. When data is at rest or in transit.

Answer: D

Explanation:
Explanation
Correct answer B. When data is at rest or in transit.
To provide maximum protection, encrypt data both in transit and at rest.

NEW QUESTION # 114
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?
Python

• A. R
• B. SAS
• C. Microsoft Power Bl

Answer: B

Explanation:
Explanation
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.

NEW QUESTION # 115
An analyst has been asked to validate data quality. Which of the following are the BEST reasons to validate data for quality control purposes? (Choose two.)

• A. Deletion
• B. Retention
• C. Transmission
• D. Integrity
• E. Consistency
• F. Encryption

Answer: D,E

NEW QUESTION # 116
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. Concatenate
• C. Append
• D. Delimit

Answer: D

NEW QUESTION # 117
Which of the following is an example of a data-mining ETL tool?

• A. SSIS
• B. Cognos
• C. SPSS
• D. Stata

Answer: A

Explanation:
Explanation
A data-mining ETL tool is a software application that performs extract, transform, and load (ETL) operations on data for data mining purposes. Data mining is the process of discovering patterns, trends, and insights from large and complex data sets. ETL tools help to prepare the data for analysis by extracting data from various sources, transforming data into a consistent and suitable format, and loading data into a data warehouse or other destination. SSIS (SQL Server Integration Services) is an example of a data-mining ETL tool that is part of Microsoft SQL Server. SSIS provides graphical tools and wizards for building and debugging ETL packages that can work with various data sources and destinations. Therefore, the correct answer is A.
References: [Data Mining - SQL Server Integration Services (SSIS) | Microsoft Docs], [What Is Data Mining?
| Oracle]

NEW QUESTION # 118
Randy scored 76 on a math test, Katie scored 86 on a science test, Ralph scored 80 on a history test, and Jean scored 80 on an English test. The table below contains the mean and standard deviation of the scores for each of the courses:

Using this information, which of the following students had the BEST score?

• A. Jean
• B. Katie
• C. Ralph
• D. Randy

Answer: B

Explanation:
Explanation
To compare the students' scores, we need to standardize them by using the z-score formula, which is:
z = (x - ) /
where x is the raw score, is the mean, and is the standard deviation. The z-score tells us how many standard deviations a score is above or below the mean. A higher z-score means a better score relative to the average.
Using the table, we can calculate the z-scores for each student as follows:
Randy: z = (76 - 70) / 2 = 3 Katie: z = (86 - 80) / 3 = 2 Ralph: z = (80 - 75) / 2 = 2.5 Jean: z = (80 - 90) / 1 =
-10
The student with the highest z-score is Randy, with a z-score of 3. This means that Randy scored 3 standard deviations above the mean in math, which is the best performance among the four students. Therefore, the correct answer is A.
References: Comparing with z-scores (video) | Z-scores | Khan Academy, 17 Important Data Visualization Techniques | HBS Online

NEW QUESTION # 119
Given the data below:

In which of the following file formats is the data presented?

• A. XML
• B. RIF
• C. Xs
• D. CSV

Answer: D

Explanation:
Explanation
The data is presented in a CSV (comma-separated values) file format, which is a plain text format that stores tabular data. Each line of the file is a data record, and each record consists of one or more fields separated by commas. The first line of the file usually contains the names of the fields, also known as the header. In this case, the data has four fields: Name, Age, Gender, and Occupation. Therefore, the correct answer is B.
References: CSV File (What It Is & How to Open One), Comma-separated values - Wikipedia

NEW QUESTION # 120
Given the diagram below:

Which of the following data schemas shown?

• A. Relational database
• B. Online transactional processing
• C. Key-value pairs
• D. Data lake

Answer: A

NEW QUESTION # 121
Encryption is a mechanism for protecting data.
When should encryption be applied to data?
Choose the best answer.

• A. When data is at rest.
• B. When data is in transit.
• C. When data is at rest, unless you are using local storage.
• D. When data is at rest or in transit.

Answer: D

Explanation:
Correct answer B. When data is at rest or in transit.
To provide maximum protection, encrypt data both in transit and at rest.

NEW QUESTION # 122
What is the median of the following numbers?
13, 2, 65, 3, 5, 4, 7, 3, 4, 7, 8, 2, 4, 4, 60, 23, 43, 2

• A. 4.5
• B. 0
• C. 1
• D. 2

Answer: A

Explanation:
Correct answer B. 4.5
To find the median, sort the numbers in your dataset and find the one located in the middle. In this case, there are an even number of observations, so we take the two middle numbers (4 and 5) and use their average as the median, making the median value 4.5.
The mode is 4, the range is 63, and the number of observations is 18.

NEW QUESTION # 123
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 attribute limitations
• B. Data constraints
• C. Data consistency
• D. Data accuracy
• E. Data bias
• F. Data manipulation

Answer: C,D

Explanation:
Explanation
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.

NEW QUESTION # 124
Which of the following is a process that is used during data integration to collect, blend, and load data?

• A. ETL
• B. OLTP
• C. BI
• D. MDM

Answer: A

Explanation:
Explanation
ETL is a process that is used during data integration to collect, blend, and load data. ETL stands for extract, transform, and load, which are the three main steps involved in moving data from different sources to a common destination, such as a data warehouse or a data lake. ETL helps to consolidate and standardize data for analysis and reporting purposes. References: CompTIA Data+ Certification Exam Objectives, page 12

NEW QUESTION # 125
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 multiple reports, one for each needed date range.
• B. Create a dashboard with a date range picker and calculations built in.
• 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 # 126
A data analyst has been asked to organize the table below in the following ways:
By sales from high to low -
By state in alphabetic order -

Which of the following functions will allow the data analyst to organize the table in this manner?

• A. Grouping
• B. Conditional formatting
• C. Sorting
• D. Filtering

Answer: C

Explanation:
Explanation
Sorting is the function that will allow the data analyst to organize the table in the desired manner. Sorting means arranging the data in a specific order, such as ascending or descending, based on one or more criteria.
Sorting can be applied to any column in the table, such as sales or state. References: CompTIA Data+ Certification Exam Objectives, page 11

NEW QUESTION # 127
Ellen is a 17-year old student enrolled in her first year of college. Under Family Educational Rights and Privacy Act FERPA, who has the right to control disclosure of her educational records to third parties?

• A. Ellen retains this right herself.
• B. In this situation, nobody is eligible to assert rights under FERPA.
• C. Ellen's parents or guardians have this right.
• D. The school exercises this right on Ellen's behalf.

Answer: A

NEW QUESTION # 128
A data analyst needs to create a data visualization that aids in un the cumulative impact of sequentially introduced values that are positive or negative. Which of the following data visualization methods should the analyst use?

• A. A line chart
• B. A scatter plot
• C. A waterfall chart
• D. A bubble chart

Answer: B

NEW QUESTION # 129
A county in Illinois is conducting a survey to determine the mean annual income per household. The county is 427sq mi (2.65q km). Which of the following sampling methods would MOST likely result in a representative sample?

• A. A stratified phone survey of 100 people that is conducted between 2:00 p.m. and 3:00 p.m.
• B. Surveys sent to 100 randomly selected homes that are reflective of the population
• C. A systematic survey that is sent to 100 single-family homes in the county
• D. Surveys sent to ten randomly selected homes within 5mi (8km) of the county's office

Answer: B

NEW QUESTION # 130
Which of the following descriptive statistical methods are measures of central tendency? (Choose two.)

• A. Minimum
• B. Maximum
• C. Correlation
• D. Variance
• E. Mean
• F. Mode

Answer: E,F

Explanation:
Explanation
Mean and mode are measures of central tendency, which describe the typical or most common value in a distribution of data. Mean is the arithmetic average of all the values in a dataset, calculated by adding up all the values and dividing by the number of values. Mode is the most frequently occurring value in a dataset.
Other measures of central tendency include median, which is the middle value when the data is sorted in ascending or descending order.

NEW QUESTION # 131
Which of the following describes a programming language and free software environment for statistical computing and graphics?

• A. SAS.
• B. Microsoft Excel.
• C. Microsoft Power BI.
• D. R.

Answer: D

NEW QUESTION # 132
Which of the following will MOST likely be streamed live?

• A. Machine data
• B. Key-value pairs
• C. Flat files
• D. Delimited rows

Answer: C

NEW QUESTION # 133
Which one of the following values will appear first if they are sorted in descending order?

• A. Molly.
• B. Adam.
• C. Aaron.
• D. Xavier.

Answer: D

NEW QUESTION # 134
......

CompTIA DA0-001 certification is an industry-recognized certification that can help individuals stand out in a competitive job market. CompTIA Data+ Certification Exam certification demonstrates that the candidate has the skills and knowledge required to manage and analyze large amounts of data effectively. Additionally, earning the certification can lead to better job opportunities and increased earning potential. Overall, the CompTIA DA0-001 certification is an excellent choice for individuals who are interested in pursuing a career in data management and analysis.

 

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