CompTIA DA0-001 Online Practice Questions and Exam Preparation

CompTIA DA0-001 Online Questions & Answers

• Question 271:

  A data analyst who works for a government agency is required to obtain the average income of citizens. The list of citizens is given in the following table:

  

  A value for one citizen's income is missing. Which of the following approaches should the data analyst take to solve this issue?

  A. Replace the missing value with the average of the rest of the unemployed citizens.
  B. Insert the value 0 into the field with the missing value.
  C. Impute the mean of the other citizens' incomes into the field with the missing value.
  D. Exclude employed citizens from the analysis.
  C. Impute the mean of the other citizens' incomes into the field with the missing value.

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  Explanation

• Question 272:

  A Chief Executive Officer (CEO) is requesting more up-to-date sales data for improved visibility prior to month-end. An analyst must determine the frequency of a sales report that was previously distributed on an as-needed basis.

  Which of the following would be the most appropriate frequency for this report?

  A. Monthly
  B. Quarterly
  C. Weekly
  D. Every other month
  C. Weekly

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  Explanation

  The most appropriate frequency for the sales report is weekly, as this will provide the CEO with more up-to-date sales data for improved visibility prior to month-end. A weekly sales report can show the sales performance, trends, and issues of the sales team on a regular basis, and help the CEO to monitor and evaluate the progress and results of the sales activities. A weekly sales report can also help the CEO to identify and address any problems or opportunities that may arise during the month, and to make timely and informed decisions.

• Question 273:

  A development company is constructing a new unit in its apartment complex. The complex has the following floor plans:

  

  Using the average cost per square foot of the original floor plans, which of the following should be the price of the Rose unit?

  A. $640,900
  B. $690,000
  C. $705,200
  D. $702,500
  C. $705,200

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  Explanation

  This is because the price of the Rose unit can be estimated using the average cost per square foot of the original floor plans, which are Jasmine, Orchid, Azalea, and Tulip. To find the average cost per square foot of the original floor plans, we can use the following formula:

  

  Plugging in the values from the original floor plans, we get:

  

  To find the price of the Rose unit, we can use the following formula:

  

  Plugging in the values from the Rose unit, we get:

  

  Therefore, the price of the Rose unit should be $705,200, using the average cost per square foot of the original floor plans.

• Question 274:

  An analyst is currently working on a ticket to revamp 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 tailored toward each specific team.
  D. Develop a more streamlined dashboard to roll out by the next delivery date.
  A. Talk to the group that made the request to determine the desired goal.

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  Explanation

• Question 275:

  Which of the following is a domain-specific language used in programming that is designed for managing data that is held in a relational data stream management system?

  A. SAS
  B. SQL
  C. Python
  D. R
  B. SQL

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  Explanation

  SQL (Structured Query Language) is a domain-specific language used in programming, specifically designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream

  management system (RDSMS). It is the standard language for relational database management systems. SQL statements are used to perform tasks such as update data on a database, or retrieve data from a database. Unlike languages like

  Python or R, which are general-purpose programming languages, SQL is tailored specifically for database management and manipulation.

  References:

  ResearchGate article on SQL.

  SpringerLink chapter on Relational Databases and SQL Language.

  DataCamp tutorial on SQL Server Installation.

  Wikipedia page on SQL.

• Question 276:

  Which of the following should an analyst do to best summarize the data on a data set?

  A. Filtering
  B. Aggregation
  C. Sorting
  D. Concatenation
  B. Aggregation

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  Explanation

• Question 277:

  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. Append
  B. Merge
  C. Concatenate
  D. Delimit
  D. Delimit

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  Explanation

  The action that must be done to the Genre column before this task can be completed is delimit. Delimit is a process of separating or splitting a string of text into multiple parts based on a delimiter, which is a character or a sequence of characters that marks the boundary between the parts. For example, a comma (,) or a semicolon (;) can be used as a delimiter. In this case, the Genre column contains multiple genres for each movie, separated by commas. To determine the most popular movie genre, the data analyst needs to delimit the Genre column by commas, so that each genre can be counted and compared separately. The other options are not relevant for this task, as they are related to combining or joining strings or tables, not separating them. Append is a process of adding or attaching one string or table to the end of another string or table. Merge is a process of combining or joining two or more tables into one table based on a common column or key. Concatenate is a process of joining or linking two or more strings together into one string.

  [How to Split Text in Excel - Exceljet]

• Question 278:

  A data analyst needs to observe the relationship between two numeric variables and identify the clustering pattern as well as the outliers. Which of the following visualizations should the analyst use?

  A. Heat map
  B. Tree map
  C. Scatter plot
  D. Stacked chart
  C. Scatter plot

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  Explanation

• Question 279:

  Which of the following is the correct data type for text?

  A. Boolean
  B. String
  C. Integer
  D. Float
  B. String

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  Explanation

  The correct data type for text is string. A string is a data type that represents a sequence of characters, such as letters, numbers, symbols, or spaces. A string can be enclosed by single quotes (' ') or double quotes (" ") in most programming

  languages. For example, `Hello', "World", and "123" are all strings. The other options are not data types for text, but for other kinds of values. A boolean is a data type that represents a logical value, either true or false. An integer is a data type

  that represents a whole number, such as 1, 0, or -5. A float is a data type that represents a number with a fractional part, such as 3.14, 0.5, or -2.7.

  Data Types - W3Schools

• Question 280:

  Given the customer table below:

  

  Which of the following chart types is the most appropriate to represent the average spending of active customers vs. inactive customers?

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

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  Explanation

  A Pie chart is the most suitable for representing the average spending of active customers versus inactive customers. Pie charts are effective for comparing parts of a whole, which makes them ideal for visually displaying the proportion of spend between two distinct groups. They are widely used to depict percentage distributions and are straightforward, allowing immediate analysis of the active vs. inactive customer spending distribution at a glance.