Easily To Pass New DA0-001 Premium Exam Updated [Nov 14, 2023]
DA0-001 Certification All-in-One Exam Guide Nov-2023
NEW QUESTION # 104
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. star schema.
- C. non-relational schema.
- D. transactional schema.
Answer: D
NEW QUESTION # 105
Given the diagram below:
Which of the following data schemas shown?
- A. Relational database
- B. Data Lake
- C. Key-value pairs
- D. Online transactional processing
Answer: A
Explanation:
Explanation
A relational database is a type of database that organizes data into tables, where each table has a fixed number of columns and a variable number of rows. Each row in a table represents a record or an entity, and each column represents an attribute or a property of that entity. The tables are linked by common fields, called keys, which enable the database to establish relationships between the data. A relational database schema is a diagram that shows the structure and organization of the tables, columns, keys, and constraints in a relational database. The diagram given in the question is an example of a relational database schema, as it shows two tables: "Runs" and "Experiments", with their respective columns, data types, and primary keys. The "Runs" table also has a foreign key that references the "ExperimentId" column in the "Experiments" table, indicating a relationship between the two tables. Therefore, the correct answer is D. References: What is a database schema? | IBM, Database Schema - Javatpoint
NEW QUESTION # 106
Which of the following is an example of a discrete variable?
- A. The time to complete a task
- B. The height of a horse
- C. The number of people in an office
- D. The temperature of a hot tub
Answer: C
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 # 107
Which of the following is the correct data type for text?
- A. Boolean
- B. String
- C. Float
- D. Integer
Answer: B
NEW QUESTION # 108
Which of the following is a characteristic of a relational database?
- A. It has undefined fields.
- B. It is structured in nature.
- C. It uses minimal memory.
- D. It utilizes key-value pairs.
Answer: B
Explanation:
Explanation
It is structured in nature. This is because a relational database is a type of database that organizes data into tables, which consist of rows and columns. A relational database is structured in nature, which means that the data has a predefined schema or format, and follows certain rules and constraints, such as primary keys, foreign keys, or referential integrity. A relational database can be used to store, query, and manipulate data using a structured query language (SQL). The other characteristics are not true for a relational database. Here is why:
It utilizes key-value pairs. This is not true for a relational database, because key-value pairs are a way of storing data that associates each value with a unique key, such as an identifier or a name. Key-value pairs are typically used in non-relational databases, such as NoSQL databases, which do not have tables, rows, or columns, but rather store data in various formats, such as documents, graphs, or columns.
It has undefined fields. This is not true for a relational database, because fields are another name for columns in a table, which define the attributes or properties of each row or record in the table. Fields have defined names, types, and lengths in a relational database, which specify the format and size of the data that can be stored in each field.
It uses minimal memory. This is not true for a relational database, because memory is the amount of space or storage that is used by a database to store and process data. Memory usage depends on various factors, such as the size, complexity, and number of tables and queries in a relational database. A relational database can use a lot of memory if it has many tables with many rows and columns, or if it performs complex or frequent queries on the data.
NEW QUESTION # 109
Analyze the values of X shown below
(2,2,5,6,7)
What is the modal value?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION # 110
A customer list from a financial services company is shown below:
A data analyst wants to create a likely-to-buy score on a scale from 0 to 100, based on an average of the three numerical variables: number of credit cards, age, and income. Which of the following should the analyst do to the variables to ensure they all have the same weight in the score calculation?
- A. Normalize the variables.
- B. Recode the variables.
- C. Calculate the standard deviations of the variables.
- D. Calculate the percentiles of the variables.
Answer: A
Explanation:
Explanation
Normalizing the variables means scaling them to a common range, such as 0 to 1 or -1 to 1, so that they have the same weight in the score calculation. Recoding the variables means changing their values or categories, which would alter their meaning and distribution. Calculating the percentiles of the variables means ranking them relative to each other, which would not account for their actual magnitudes. Calculating the standard deviations of the variables means measuring their variability, which would not make them comparable.
References: CompTIA Data+ Certification Exam Objectives, page 10
NEW QUESTION # 111
A military commander would like to see the health scorecards of the troops daily and filter them based on gender and rank. Considering this data is PHI, which of the following would be the best way for the commander to view the information?
- A. A cloud-hosted spreadsheet
- B. An emailed report
- C. A daily printout of a report
- D. A password-protected dashboard
Answer: D
Explanation:
Explanation
A password-protected dashboard is a type of web-based application that can display the health scorecards of the troops in a secure and interactive way. A password-protected dashboard can provide the following benefits for the commander:
It can protect the PHI data from unauthorized access or disclosure by requiring a valid username and password to log in. This can ensure that only the commander and other authorized personnel can view the information12 It can allow the commander to filter the data based on gender and rank by using drop-down menus, sliders, checkboxes, or other controls. This can enable the commander to customize the view and focus on the relevant data13 It can update the data daily by connecting to a data source that refreshes automatically or on demand. This can ensure that the commander always sees the latest and most accurate information14 It can present the data in a visual and intuitive way by using charts, graphs, tables, or other elements. This can help the commander to understand and analyze the data more easily and effectively1
NEW QUESTION # 112
What is the final stage of the data lifecycle?
- A. Archive.
- B. Store.
- C. Share.
- D. Destroy.
Answer: D
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 # 113
Which of the following statistical methods requires two or more categorical variables?
- A. Z-test
- B. Two-sample t-test
- C. Simple linear regression
- D. Chi-squared test
Answer: D
Explanation:
Explanation
This is because a chi-squared test is a type of statistical method that tests the association or independence between two or more categorical variables, such as gender, race, or occupation. A chi-squared test can be used to compare the observed frequencies of the categories with the expected frequencies under the null hypothesis of no association or independence. For example, a chi-squared test can be used to determine if there is a relationship between smoking and lung cancer. The other statistical methods do not require two or more categorical variables. Here is why:
Simple linear regression is a type of statistical method that models the relationship between a continuous dependent variable and a continuous or categorical independent variable, such as height, weight, or education level. A simple linear regression can be used to estimate the slope and intercept of the best-fitting line that describes how the dependent variable changes with the independent variable. For example, a simple linear regression can be used to predict the weight of a person based on their height.
Z-test is a type of statistical method that tests the significance of the difference between a sample mean and a population mean, or between two sample means, when the population standard deviation or the sample sizes are large enough. A z-test can be used to compare the average scores of two groups of students on a standardized test.
Two-sample t-test is a type of statistical method that tests the significance of the difference between two sample means when the population standard deviation is unknown or the sample sizes are small. A two-sample t-test can be used to compare the average salaries of two groups of employees in different departments.
NEW QUESTION # 114
Which of the following would be considered non-personally identifiable information?
- A. Customer's name
- B. Government ID number
- C. Telephone number
- D. Cell phone device name
Answer: D
NEW QUESTION # 115
What would be an example of an acceptable form of primary identification for the Data+ exam?
- A. School ID card.
- B. Passport.
- C. Credit card with photo and signature.
- D. Employee ID card.
Answer: B
NEW QUESTION # 116
An analyst has received the requirements for an internal user dashboard. The analyst confirms the data sources and then creates a wireframe. Which of the following is the NEXT step the analyst should take in the dashboard creation process?
- A. Deploy to production.
- B. Create subscriptions.
- C. Optimize the dashboard.
- D. Get stakeholder approval.
Answer: C
NEW QUESTION # 117
An analyst is working on a project for a director. During this process. the analyst pulled the data. created summarized tables and graphs with descriptions, created a report summary, and inserted all items into a report.
After writing the report, which of the following would be the most appropriate next step?
- A. Complete an audit on the data pulled for the report.
- B. Complete a check for quality in the report.
- C. Complete a trend analysis to be included in the report.
- D. Complete a review of the data and a check for consistency
Answer: B
Explanation:
Explanation
After writing the report, the most appropriate next step for the analyst is to complete a check for quality in the report. This involves reviewing the report for accuracy, clarity, completeness, consistency, and relevance. The analyst should ensure that the report addresses the director's business questions and objectives, that the data and analysis are correct and reliable, that the tables and graphs are well-designed and easy to understand, that the descriptions and summary are concise and informative, and that there are no errors or inconsistencies in the report. A quality check will help the analyst to improve the presentation and communication of the report, as well as to avoid any misunderstandings or misinterpretations by the director1.
NEW QUESTION # 118
Which of the following is the correct data type for text?
- A. Boolean
- B. String
- C. Float
- D. Integer
Answer: B
Explanation:
Explanation
A string is a data type that represents a sequence of characters, such as text, symbols, numbers, or punctuation marks. Strings are enclosed in quotation marks, such as "Hello", "123", or "!@#". Strings can be manipulated, concatenated, sliced, indexed, formatted, and searched using various methods and functions. A string is different from other data types, such as boolean, integer, or float, which represent logical values (true or false), whole numbers, or decimal numbers respectively. Therefore, the correct answer is B. References: What is a String? | Definition and Examples, Python String Methods
NEW QUESTION # 119
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CompTIA DA0-001, also known as the CompTIA Data+ Certification, is a vendor-neutral certification exam that is designed to test the knowledge and skills of individuals working in the field of data management. CompTIA Data+ Certification Exam certification validates the ability of professionals to collect, analyze, and interpret large sets of data and make informed decisions based on the analysis. DA0-001 exam covers a wide range of topics including data storage, data quality, data visualization, data governance, and data security. It is an ideal certification for individuals who are interested in pursuing a career in data analysis or data management.
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