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DA0-001 Free Certification Exam Material with 365 Q&As
NEW QUESTION # 43
A data analyst has been asked to create an ad-hoc sales report for the Chief Executive Officer (CEO).
Which of the following should be included in the report?
- A. Line-item SKU numbers.
- B. The sales representatives' home addresses.
- C. YTD total sales.
- D. The customers' first and last names.
Answer: C
Explanation:
Explanation
The report for the CEO should include YTD total sales, as this will provide a high-level overview of the sales performance of the company and show how it is meeting its annual goals. The other options are not appropriate for the CEO, as they are either too detailed or irrelevant for the report. The sales representatives' home addresses, line-item SKU numbers, and customers' first and last names are not related to the sales performance and might compromise the privacy and security of the data. Reference: CompTIA Data+ (DA0-001) Practice Certification Exams | Udemy
NEW QUESTION # 44
What GAPP principle says that organizations should provide data subjects with the ability to review and update their personal information?
- A. Notice
- B. Consent
- C. Choice
- D. Access
Answer: D
NEW QUESTION # 45
An analyst is reporting on the average income for a county and is reviewing the following data:
Which of the following is the reason the analyst would need to cleanse the data in this data set?
- A. Data completeness
- B. Missing values
- C. Duplicate data
- D. Data outliers
Answer: D
NEW QUESTION # 46
What category of data stewardship work is focused on ensuring that the organization respects the wishes of data subjects?
- A. Regulatory compliance.
- B. Data quality.
- C. Data privacy.
- D. Data security.
Answer: C
Explanation:
Data privacy defines who has access to data, while data protection provides tools and policies to actually restrict access to the data. Compliance regulations help ensure that user's privacy requests are carried out by companies, and companies are responsible to take measures to protect private user data.
Why is data privacy important?
When data that should be kept private gets in the wrong hands, bad things can happen. A data breach at a government agency can, for example, put top secret information in the hands of an enemy state. A breach at a corporation can put proprietary data in the hands of a competitor.
NEW QUESTION # 47
Exhibit.
Which of the following logical statements results in Table B?
- A.
- B.
- C.
- D.
Answer: B
Explanation:
Explanation
The logical statement that results in Table B is Option D. Option D is a logical statement that uses the AND operator to combine two conditions: Name = "Tom" and Region = "BC". The AND operator returns true only if both conditions are true, otherwise it returns false. Therefore, Option D will select only the rows from Table A that satisfy both conditions, which are rows 4, 5, 6, and 7. These rows form Table B, as shown below:
Name | Gender flag | Level | College | Code | Region Tom | Male | Elementary | A | BC | BC Kim | Female | Elementary | A | BC | BC Pat | Female | Elementary | A | BC | BC Ben | Male | Elementary | A | BC | BC The other options are not correct, as they use different logical operators or conditions that do not result in Table B. Option A uses the OR operator, which returns true if either condition is true, or both. Option A will select all the rows from Table A except row 3, which does not match either condition. Option B uses the NOT operator, which returns the opposite of the condition. Option B will select all the rows from Table A except rows 4, 5, 6, and 7, which match the condition. Option C uses a different condition, Region = "ON", which does not match any row in Table A. Option C will select no rows from Table A. Reference: [SQL Logical Operators - W3Schools]
NEW QUESTION # 48
A data analyst has removed the outliers from a data set due to large variances. Which of the following central tendencies would be the best measure to use?
- A. Median
- B. Mean
- C. Range
- D. Mode
Answer: A
Explanation:
The median is recognized as the most appropriate measure of central tendency when outliers have been removed from a dataset. This is because the median is less influenced by extreme values compared to the mean. When outliers are present, they can significantly skew the mean, making it an unreliable measure of central tendency. The median, on the other hand, is the middle value of a dataset when ordered from least to greatest and remains unaffected by the extremes. Therefore, it provides a better representation of the central location of the data after outliers have been excluded.
References:
* Guidelines for Removing and Handling Outliers in Data1.
* Mean, Median, and Mode: Measures of Central Tendency2.
* Which measure of central tendency should be used when there is an outlier?3.
* How are measures of central tendency affected by outliers?4.
NEW QUESTION # 49
Which of the following tools would be best to use to calculate the interquartile range, median, mean, and standard deviation of a column in a table that has 5.000.000 rows?
- A. SQL
- B. R
- C. Microsoft Excel
- D. Snowflake
Answer: B
NEW QUESTION # 50
A data analyst needs to create a weekly recurring report on sales performance and distribute it to all sales managers. Which of the following would be the BEST method to automate and ensure successful delivery for this task?
- A. Print out a copy.
- B. Use scheduled report delivery.
- C. Upload the report to the server.
- D. Implement subscription access delivery.
Answer: B
Explanation:
Scheduled report delivery is a feature that allows a data analyst to automate the generation and distribution of a report at a specified time and frequency. This would be the best method to ensure that the sales managers receive the weekly report on sales performance without manual intervention. Subscription access delivery is a feature that allows users to subscribe to a report and access it on demand, but it does not automate the delivery. Printing out a copy or uploading the report to the server are manual methods that require more time and effort from the data analyst. Reference: CertMaster Practice for Data+ Exam Prep - CompTIA
NEW QUESTION # 51
An organization wants to evaluate whether project activities are within the set projections and in line to meet the desired project targets. Which of the following types of analysis is best suited for this situation?
- A. Trend analysis
- B. Descriptive analysis
- C. Performance analysis
- D. Exploratory analysis
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Performance analysisis used toassess whether activities, projects, or processes are meeting predefined goals. It compares actual performance against benchmarks or expectations.
* Option A (Trend analysis):Incorrect. Trend analysis looks at data over time to identify patterns or movements, but it does not measure progress against goals.
* Option B (Performance analysis):Correct.This type of analysis is specifically used toevaluate progress against projections and targets.
* Option C (Descriptive analysis):Incorrect. Descriptive analysis summarizes historical data but does not evaluate whether targets are being met.
* Option D (Exploratory analysis):Incorrect. Exploratory analysis is used todiscover patterns and anomaliesrather than to track progress against predefined objectives.
NEW QUESTION # 52
An analyst reviews the following data:
7
3
5
2
3
7
7
10
Which of the following is the value of the mode?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
The mode is the value that appears most frequently in a data set. In the provided data set, the number 7 appears three times, which is more than any other number. Therefore, the mode of this data set is 7.
* 3 appears twice, but less frequently than 7.
* 5 and 10 each appear only once, so they cannot be the mode.
References:
* Mode in Statistics - Definition and Examples1
* Understanding Measures of Central Tendency2
* Mode (statistics) - Wikipedia3
NEW QUESTION # 53
Which of the following would a data analyst look for first if 100% participation is needed on survey results?
- A. Invalid data
- B. Duplicate data
- C. Redundant data
- D. Missing data
Answer: D
Explanation:
Missing data is a type of data quality issue that occurs when some values in a data set are not recorded or available. Missing data can affect the validity and reliability of survey results, especially if the missing values are not random or ignorable. Missing data can also reduce the sample size and the statistical power of the analysis12 If 100% participation is needed on survey results, a data analyst would look for missing data first, because missing data would indicate that some participants did not complete or submit the survey, or that some responses were not recorded or transmitted correctly. A data analyst would need to identify the causes and patterns of missing data, and apply appropriate methods to handle or prevent missing data, such as imputation, deletion, weighting, or follow-up12
NEW QUESTION # 54
Which of the following analysis techniques is an unsupervised data mining process?
- A. Clustering
- B. Predictive
- C. Descriptive
- D. Regression
Answer: A
Explanation:
Comprehensive and Detailed In-Depth
Unsupervised data mining techniques are used to identify hidden patterns or intrinsic structures in data without prior labels or classifications. Among the options provided,clusteringis a primary unsupervised learning method.
Option A:Clustering
Rationale:Clustering involves grouping a set of objects in such a way that objects in the same group (or cluster) are more similar to each other than to those in other groups. This technique is unsupervised because it doesn't rely on predefined labels and is used to discover natural groupings within data.
Reference:
partners.comptia.org
Option B:Descriptive
Rationale:Descriptive analysis summarizes or describes the main features of a dataset, often through statistical measures or visualizations. While it provides insights into the data, it is not a data mining process but rather a preliminary step in data analysis.
Option C:Regression
Rationale:Regression analysis is a supervised learning technique used to model and analyze the relationships between variables. It requires labeled data to predict outcomes and is not considered an unsupervised process.
Option D:Predictive
Rationale:Predictive analysis involves using historical data to make predictions aboutfuture events. It often employs supervised learning techniques and relies on labeled datasets to train models.
NEW QUESTION # 55
What symbol is used for the variance of a population of data?
- A. 0x2
- B. s
- C. 0
- D. 2x2
Answer: A
Explanation:
The sample variance is defined by(15.59)We use the symbol sx2 for a sample variance and the symbol ox2 for a population variance.
NEW QUESTION # 56
Which of the following data types would a telephone number formatted as XXX-XXX-XXXX be considered?
- A. Numeric
- B. Text
- C. Float
- D. Date
Answer: B
Explanation:
Explanation
A telephone number formatted as XXX-XXX-XXXX would be considered a text data type, as it is composed of alphanumeric characters and symbols. A numeric data type is composed of only numbers, such as integers or decimals. A date data type is composed of values that represent dates or times, such as YYYY-MM-DD or HH:MM:SS. A float data type is composed of numbers with fractional parts, such as 3.14 or 0.5.
Reference: Guide to CompTIA Data+ and Practice Questions - Pass Your Cert
NEW QUESTION # 57
Which of the following best describes a difference between JSON and XML?
- A. JSON is quicker to read and write.
- B. JSON is much more difficult to parse.
- C. JSON has to use an end tag.
- D. JSON strings are longer
Answer: A
Explanation:
The best answer is A. JSON is quicker to read and write.
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is based on the JavaScript programming language and easy to understand and generate. JSON uses a simple syntax that consists of name- value pairs and arrays, and does not require any end tags or attributes. JSON is quicker to read and write than XML (Extensible Markup Language), which is a markup language that uses a tag structure to represent data items. XML has a more complex and verbose syntax that requires end tags, attributes, and namespaces123
NEW QUESTION # 58
An analyst needs to conduct a quick analysis. Which of the following is the FIRST step the analyst should perform with the data?
- A. Conduct a trend analysis and use a scatter chart.
- B. Conduct an initial analysis and use a Pareto chart.
- C. Conduct an exploratory analysis and use descriptive statistics.
- D. Conduct a link analysis and illustrate the connection points.
Answer: C
NEW QUESTION # 59
The current date is July 14, 2020. A data analyst has been asked to create a report that shows the company's year-over-year Q2 2020 sales. Which of the following reports should the analyst compare?
- A. Q2 2020 and Q2 2021
- B. A Q2 2020 and Q4 2019
- C. Q2 2020 and Q2 2019
- D. YTD 2020 and YTD 2019
Answer: C
Explanation:
To create a report that shows the company's year-over-year Q2 2020 sales, the analyst should compare the sales data from Q2 2020 and Q2 2019. Year-over-year (YoY) analysis is a method of comparing the performance of a business or a financial instrument over the same period in different years. It helps to identify trends, growth patterns, and seasonal fluctuations. Q2 refers to the second quarter of a year, which is usually from April to June. Therefore, the correct answer is C. References: YoY - Year over Year Analysis - Definition, Explanation & Examples, What is an Annual Sales Report: Definition, metrics, and tips - Snov.io
NEW QUESTION # 60
A junior web developer is developing a new application where users can upload short videos. The first task is to create a homepage that shows the headline "Upload Your Short Videos" and a clickable button that says
"upload now".
Which of the following HTML commands would help the developer to complete the task successfully?
- A. < span >Upload Your Short Videos< /span >< button >upload now< /button >
- B. < hl >Upload Your Short Videos< /h1 >< hl >upload now< /h1 >
- C. < hl >Upload Your Short Videos< /h1 >< button >upload now< /button >
- D. < p >Upload Your Short Videos< /p >< p >upload now< /p >
Answer: C
Explanation:
The HTML commands that would help the developer to complete the task successfully are <h1>Upload Your Short Videos</h1> and <button>upload now</button>. The <h1> tag defines a heading level 1, which is the largest and most important heading on a webpage. The <button> tag defines a clickable button that can perform some action when clicked. The other options are not suitable for the task, as they either use the wrong tags or do not create a clickable button. The <span> tag defines a section of text with no specific meaning or formatting. The <p> tag defines a paragraph of text. The <hl> tag does not exist in HTML. Reference: HTML Tags - W3Schools
NEW QUESTION # 61
Which of the following will MOST likely be streamed live?
- A. Flat files
- B. Machine data
- C. Delimited rows
- D. Key-value pairs
Answer: B
NEW QUESTION # 62
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. Concatenate
- B. Append
- C. Merge
- D. Delimit
Answer: D
Explanation:
Delimiting is the process of splitting a column of data into multiple columns based on a separator or delimiter character. Delimiting can help separate data that is combined or concatenated in one column into distinct values or categories. For example, if a column contains text values that are separated by commas, such as "Comedy, Suspense", delimiting can split this column into two columns, one for "Comedy" and one for "Suspense". Delimiting is different from other options, such as appending, merging, or concatenating, which are methods of combining or joining data from multiple columns or sources. In this case, the data analyst needs to determine the most popular movie genre based on the Genre column in the table. However, this column contains multiple genres for each movie, separated by commas. Therefore, the data analyst must delimit this column before this task can be completed. Therefore, the correct answer is D. Reference: Split text into different columns with functions - Office Support, How to Split Text in Excel (Using Formulas & Split Function)
NEW QUESTION # 63
A data analyst has been asked to create an ad-hoc sales report for the Chief Executive Officer (CEO).
Which of the following should be included in the report?
- A. Line-item SKU numbers.
- B. The sales representatives' home addresses.
- C. YTD total sales.
- D. The customers' first and last names.
Answer: C
Explanation:
The report for the CEO should include YTD total sales, as this will provide a high-level overview of the sales performance of the company and show how it is meeting its annual goals. The other options are not appropriate for the CEO, as they are either too detailed or irrelevant for the report. The sales representatives' home addresses, line-item SKU numbers, and customers' first and last names are not related to the sales performance and might compromise the privacy and security of the data. Reference: CompTIA Data+ (DA0-001) Practice Certification Exams | Udemy
NEW QUESTION # 64
Which of the following is the best description of discrete data types?
- A. Non-numeric data used to describe attributes of a population sample ranked in a specific order
- B. Numeric values that can be measured on a continuous scale
- C. Non-numeric data used to describe attributes of a population sample
- D. The frequency of the number of times each value occurs by using whole numbers
Answer: D
NEW QUESTION # 65
Which of the following data types would a telephone number formatted as XXX-XXX-XXXX be considered?
- A. Numeric
- B. Text
- C. Float
- D. Date
Answer: B
NEW QUESTION # 66
What colors are commonly used for the change bars in a waterfall chart?
- A. Blue and Green
- B. Red and Yellow
- C. Red and Green
- D. Blue and Yellow
Answer: C
NEW QUESTION # 67
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