DA0-001ブレーン問題集リアル試験最新問題2024年02月23日には215問題
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質問 # 57
Consider this dataset showing the retirement age of 11 people, in whole years:
54, 54, 54, 55, 56, 57, 57, 58, 58, 60, 60
This tables show a simple frequency distribution of the retirement age data.
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
解説：
A measure of central tendency (also referred to as measures of centre or central location) is a summary measure that attempts to describe a whole set of data with a single value that represents the middle or centre of its distribution.
There are three main measures of central tendency: the mode, the median and the mean. Each of these measures describes a different indication of the typical or central value in the distribution.
What is the mode?
The mode is the most commonly occurring value in a distribution.
The most commonly occurring value is 54, therefore the mode of this distribution is 54 years.
質問 # 58
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. non-relational schema.
- B. snowflake schema.
- C. transactional schema.
- D. star schema.
正解：C
質問 # 59
Oliver is designing an ETL process to copy sales data into a data warehouse on a hourly basis.
What approach should Oliver choose that would be most efficient and minimize the chance of losing historical data?
- A. Delta load.
- B. Purge and load.
- C. Bulk load.
- D. Use ELT instead of ETL.
正解：A
解説：
Correct answer D. Delta load
Since Oliver needs to migrate changes every hour, a delta load is the best approach.
質問 # 60
Data definitions should be written in plain language.
- A. False.
- B. True.
正解：B
質問 # 61
An analyst is required to run a text analysis of data that is found in articles from a digital news outlet. Which of the following would be the BEST technique for the analyst to apply to acquire the data?
- A. Sampling
- B. ETL
- C. Web scraping
- D. Data wrangling
正解：C
質問 # 62
Which of the following is an example of a flat file?
- A. PDF file
- B. CSV file
- C. JPEG file
- D. JSON file
正解：B
解説：
Explanation
A CSV file is a type of flat file that stores data as plain text in a table-like structure with rows and columns.
Each row represents a single record, while columns represent fields or attributes of the data. A CSV file uses commas or other delimiters to separate the values in each row. A CSV file can be easily imported or exported by various applications and programs12
質問 # 63
Which of following is a non-relational database?
- A. SQLite
- B. MySQL
- C. Neo4j
- D. PostgreSQL
正解：C
解説：
Explanation
Neo4j is a type of non-relational database that uses a graph model to store data. A graph database is a database that represents data as nodes and edges, where nodes are entities and edges are relationships between them. A graph database can store complex and diverse data that is not easily structured in tables. A graph database can also perform fast and efficient queries on the data by traversing the connections between the nodes
質問 # 64
A data analyst is asked on the morning of April 9, 2020, to create a sales report that identifies sales year to date. The daily sales data is current through the end of the day. Which of the following date ranges should be on the report?
- A. January 1, 2020 to April 7, 2020
- B. January 1, 2020 to April 8, 2020
- C. January 1, 2020 to April 9, 2020
- D. January 1, 2020 to April 1, 2020
正解：C
質問 # 65
Which one of the following is a common data warehouse schema?
- A. Sphere.
- B. Square.
- C. Snowflake.
- D. Spiral.
正解：C
解説：
Explanation
Snowflake enables data storage, processing, and analytic solutions that are faster, easier to use, and far more flexible than traditional offerings. The Snowflake data platform is not built on any existing database technology or "big data" software platforms such as Hadoop.
質問 # 66
A publishing group has requested a dashboard to track submissions before publication. A key requirement is that all changes are tracked, as multiple users will be checking out documents and editing them before submissions are considered final. Which of the following is the BEST way to meet this stakeholder requirement?
- A. Present a data refresh date at the top of the dashboard.
- B. Confirm the dashboard is adhering to the corporate style guide.
- C. Use permissions to ensure users only see certain versions of the submissions.
- D. Display the version number next to each submission on the dashboard.
正解：D
質問 # 67
Daniel is using the structured Query language to work with data stored in relational database.
He would like to add several new rows to a database table.
What command should he use?
- A. INSERT.
- B. ALTER.
- C. SELECT.
- D. UPDATE.
正解：A
解説：
Explanation
INSERT
The INSERT command is used to add new records to a database table.
The SELECT command is used to retrieve information from a database. It's the most commonly used command in SQL because it is used to pose queries to the database and retrieve the data that you're interested in working with.
The UPDATE command is used to modify rows in the database.
The CREATE command is used to create a new table within your database or a new database on your server.
質問 # 68
Encryption is a mechanism for protecting data.
When should encryption be applied to data?
Choose the best answer.
- A. When data is at rest or in transit.
- B. When data is in transit.
- C. When data is at rest.
- D. When data is at rest, unless you are using local storage.
正解：A
解説：
Explanation
Correct answer B. When data is at rest or in transit.
To provide maximum protection, encrypt data both in transit and at rest.
質問 # 69
An analyst has been tracking company intranet usage and has been asked to create a chat to show the most-used/most-clicked portions of a homepage that contains more than 30 links. Which of the following visualizations would BEST illustrate this information?
- A. Pie chart
- B. Infographic
- C. Heat map
- D. Scatter plot
正解：C
解説：
Explanation
This is because a heat map is a visualization that uses colors to represent different values or intensities of a variable. A heat map can be used to show the most-used/most-clicked portions of a homepage that contains more than 30 links by assigning different colors to each link based on how frequently they are clicked by the users. For example, a link that is clicked very often can be colored red, while a link that is clicked rarely can be colored blue. A heat map can help the analyst to identify which links are more popular or important than others on the homepage. The other visualizations are not as effective as a heat map for this purpose. Here is why:
A scatter plot is a visualization that uses dots or points to represent the relationship between two variables. A scatter plot cannot show the most-used/most-clicked portions of a homepage that contain more than 30 links because it does not have a clear way of mapping each link to a point on the graph.
A pie chart is a visualization that uses slices or sectors to represent the proportion of each category in a whole.
A pie chart cannot show the most-used/most-clicked portions of a homepage that contains more than 30 links because it does not have enough space to display all the categories clearly and accurately.
An infographic is a visualization that uses images, icons, charts, and text to convey information or tell a story.
An infographic cannot show the most-used/most-clicked portions of a homepage that contain more than 30 links because it does not have a consistent or standardized way of representing each link and its click frequency.
質問 # 70
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's parents or guardians have this right.
- B. Ellen retains this right herself.
- C. In this situation, nobody is eligible to assert rights under FERPA.
- D. The school exercises this right on Ellen's behalf.
正解：B
質問 # 71
Taylor wants to investigate how manufacturing, marketing, and sales expenditures impact overall profitability for her company.
Which of the following systems is the most appropriate?
- A. OLTP.
- B. OLAP.
- C. Data mart.
- D. Data warehouse.
正解：D
解説：
A Data mart is too narrow, because Taylor needs data from across multiple divisions.
OLAP is a broad term for analytical processing, and OLTP systems are transactional and not ideal for the task. Since Taylor is working with data across multiple different divisions, she will work with a Data warehouse.
質問 # 72
An analyst is preparing a report that contains weather data. The temperatures are shown in Fahrenheit. but they must be reported in Celsius. Which of the following should the analyst do to fix this issue?
- A. Standardize the data.
- B. Rescale the data.
- C. Aggregate the data.
- D. Normalize the data.
正解：B
解説：
Explanation
The analyst should rescale the data to fix this issue. Rescaling is a process of transforming data from one scale to another, such as changing the units of measurement. In this case, the analyst needs to rescale the temperatures from Fahrenheit to Celsius, which are two different scales for measuring temperature. To do this, the analyst can use the following formula:
Celsius = (Fahrenheit - 32) * 5/9
This formula converts each temperature value from Fahrenheit to Celsius by subtracting 32 and multiplying by
5/9. For example, if the temperature is 68°F, the rescaled value in Celsius is:
Celsius = (68 - 32) * 5/9 Celsius = 20°C
Rescaling the data can help the analyst to report the temperatures in a consistent and accurate way, and to avoid any confusion or errors that may arise from using different scales. Rescaling can also make the data more comparable and compatible with other data sources or standards that use the same scale12.
質問 # 73
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