CompTIA DA0-001 Online Practice Questions and Exam Preparation

CompTIA DA0-001 Online Questions & Answers

• Question 251:

  A reporting analyst is creating a dashboard that shows the year-over-year performance for a sales organization.

  Which of the following is the best visual for the analyst use to illustrate the organization's performance?

  A. Pie chart
  B. Scatter plot
  C. Heat map
  D. Line chart
  D. Line chart

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  Explanation

• Question 252:

  A web developer wants to ensure that malicious users can't type SQL statements when they asked for input, like their username/userid.

  Which of the following query optimization techniques would effectively prevent SQL Injection attacks?

  A. Indexing.
  B. Subset of records.
  C. Temporary table in the query set.
  D. Parametrization.
  D. Parametrization.

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  Explanation

  The correct answer is D: Parametrization. Parameterized SQL queries allow you to place parameters in an SQL query instead of a constant value. A parameter takes a value only when the query is executed, allowing the query to be reused with different values and purposes. Parameterized SQL statements are available in some analysis clients, and are also available through the Historian SDK. For example, you could create the following conditional SQL query, which contains a parameter for the collector's name: SELECT* FROM ExamsDigest WHERE coursename=? ORDER BY tagname SQL Injection is best prevented through the use of parameterized queries.

• Question 253:

  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. 90

  B. 60

  C. 70

  D. 80

  Correct Answer. B
  B

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  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

• Question 254:

  A database administrator is required to mask certain table columns containing Pll in order to comply with the company privacy policy.

  Which of the following are the most likely types of information the administrator should mask? (Select two).

  A. Government-issued ID
  B. Address
  C. Order ID
  D. Order date
  E. Customer ID
  F. Referral number
  A. Government-issued ID
  B. Address

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  Explanation

• Question 255:

  After completing web scraping, which of the following file formats needs to be parsed?

  A. .html
  B. .txt
  C. .csv
  D. .tsv
  A. .html

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  Explanation

  The correct answer is .html.

  Short Web scraping is the process of extracting data from websites by parsing the HTML code of the web pages. HTML stands for HyperText Markup Language and it is the standard markup language for creating web pages and web

  applications. HTML files have the extension .html and they contain tags, elements, attributes, and content that define the structure and appearance of a web page. Web scraping tools need to parse the HTML files to extract the relevant data

  from the web pages.

• Question 256:

  An analyst must obtain the average daily sales for the following week: Which of the following must the analyst perform to obtain this value?

  

  A. Data normalization
  B. Data append
  C. Data aggregation
  D. Data blending
  C. Data aggregation

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  Explanation

  Data aggregation is the process of compiling data from multiple sources and summarizing it into a single dataset. Data aggregation can be used to calculate statistics, such as averages, sums, counts, or percentages. In this case, the analyst must obtain the average daily sales for the following week, which is a statistic that can be calculated by aggregating the sales data from each day and dividing by the number of days. Data aggregation can be done using various tools and methods, such as spreadsheets, databases, or programming languages.

• Question 257:

  Which of the following data types is best for representing count data?

  A. Discrete
  B. Referential
  C. Sequential
  D. Continuous
  A. Discrete

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  Explanation

• Question 258:

  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. Web scraping
  B. Sampling
  C. Data wrangling
  D. ETL
  A. Web scraping

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  Explanation

  This is because web scraping is a technique that allows the analyst to extract data from web pages, such as articles from a digital news outlet. Web scraping can be done using various tools and methods, such as Python libraries, browser extensions, or online services. The other techniques are not suitable for acquiring data from web pages. Here is why: Sampling is a technique that involves selecting a subset of data from a larger population, usually for statistical analysis or testing purposes. Sampling does not help the analyst to acquire data from web pages, but rather to reduce the amount of data to be analyzed. Data wrangling is a technique that involves transforming and cleaning data to make it suitable for analysis or visualization. Data wrangling does not help the analyst to acquire data from web pages, but rather to improve the quality and usability of the data. ETL stands for Extract, Transform, and Load, which is a process that involves moving data from one or more sources to a destination, such as a data warehouse or a database. ETL does not help the analyst to acquire data from web pages, but rather to store and organize the data.

• Question 259:

  An analyst is designing a dashboard that will provide a story of the sales and sales customer ratio. The following data is available:

  

  Which of the following charts should the analyst consider including in the dashboard?

  A. A column chart with site and sales
  B. A line chart with site and sales
  C. A pie chart with site and sales
  D. A scatter chart with site and sales
  A. A column chart with site and sales

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  Explanation

  For a dashboard that aims to tell a story about sales and the sales customer ratio, a column chart is an effective choice. Column charts are particularly useful for showing data changes over a period of time or for illustrating comparisons

  among items. In this case, a column chart can clearly display the sales figures for each site, allowing for easy comparison across different sites. Additionally, it can be used to represent the sales customer ratio by showing the proportion of

  sales per customer, which can provide insights into customer behavior and sales effectiveness.

  Line charts are best suited for displaying data trends over time, rather than for comparing individual categories.

  Pie charts could show the proportion of sales for each site, but they are not as effective as column charts for comparing multiple categories. Scatter charts are used to show the relationship between two variables, which is not the focus in this

  scenario.

  References:

  Effective Use of Column Charts

  Choosing the Right Chart for Your Data

  Sales Dashboards: Examples and Templates

• Question 260:

  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?

  A. Data mart.
  B. OLAP.
  C. Data Warehouse.
  D. OLTP.
  C. Data Warehouse.

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  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.