合格させるDA0-001試験一発合格保証100%カバー率でリアル試験問題 [2023年11月]
有効なDA0-001テスト解答CompTIA DA0-001試験PDF問題を試そう
質問 # 93
An analyst runs a report on a daily basis, and the number of datapoints must be validated before the data can be analyzed. The number of datapoints increases each day by approximately 20% of the total number from the day before. On a given day, the number of datapoints was 8,798. Which of the following should be the total number of datapoints on the next day?
- A. 7,038
- B. 10,800
- C. 9,600
- D. 10,600
正解：D
解説：
Explanation
This is because the number of datapoints increases each day by approximately 20% of the total number from the day before. Therefore, to find the number of datapoints on the next day, we can use the formula:
Plugging in the given values, we get:
Since we are dealing with whole numbers, we can round up the result to the nearest integer, which is 10,600.
質問 # 94
A data analyst has been asked to organize the table below in the following ways:
By sales from high to low -
By state in alphabetic order -
Which of the following functions will allow the data analyst to organize the table in this manner?
- A. Grouping
- B. Conditional formatting
- C. Filtering
- D. Sorting
正解：D
質問 # 95
What three technological innovations contribute to modern analytics?
Choose three answers.
- A. Storage.
- B. Dashboard.
- C. Computing.
- D. Data.
正解：A、C、D
質問 # 96
An analyst needs to provide a chart to identify the composition between the categories of the survey response data set:
Which of the following charts would be BEST to use?
- A. Line
- B. Pie
- C. Histogram
- D. Waterfall
- E. Scatter pot
正解：B
解説：
Explanation
The best chart to use to identify the composition between the categories of the survey response data set is a pie chart. A pie chart is a circular chart that shows the relative proportions of different categories in a whole. A pie chart is divided into slices that represent the percentage or frequency of each category. A pie chart is suitable for displaying categorical data that has a few categories and does not have any hierarchical or temporal relationship. In this case, a pie chart can show the composition of the favorite colors among the survey respondents, as well as the percentage of each color. The other options are not as good as a pie chart for this purpose, as they are more suitable for displaying numerical data that has some kind of distribution, trend, correlation, or comparison. A histogram is a bar chart that shows the frequency distribution of a single numerical variable. A line chart is a chart that shows the change of one or more numerical variables over time or another continuous variable. A scatter plot is a chart that shows the relationship between two numerical variables by plotting them as points on a Cartesian plane. A waterfall chart is a chart that shows how an initial value is increased or decreased by a series of intermediate values, resulting in a final value. Reference:
[Choosing the Right Chart Type - DataCamp]
質問 # 97
You recently downloaded a file containing website visitor logs from your organization's web server.
What term best describes these logs at this point in the process?
- A. Information.
- B. Intelligence.
- C. Data.
- D. Schema.
正解：C
質問 # 98
When analyzing the values of two variables, you decide to convert both variables so they are on a scale of 0 to 1.
What term describes this action?
- A. Filtering.
- B. Normalization.
- C. Aggregation.
- D. Transposition.
正解：B
解説：
Normalization is the process of reorganizing data in a database so that it meets two basic requirements: There is no redundancy of data, all data is stored in only one place. Data dependencies are logical, all related data items are stored together.
Put simply, data normalization ensures that your data looks, reads, and can be utilized the same way across all of the records in your customer database. This is done by standardizing the formats of specific fields and records within your customer database.
質問 # 99
Given the following customer and order tables:
Which of the following describes the number of rows and columns of data that would be present after performing an INNER JOIN of the tables?
- A. Seven rows, eight columns
- B. Five rows, eight columns
- C. Eight rows, seven columns
- D. Nine rows, five columns
正解：A
解説：
Explanation
This is because an INNER JOIN is a type of join that combines two tables based on a matching condition and returns only the rows that satisfy the condition. An INNER JOIN can be used to merge data from different tables that have a common column or a key, such as customer ID or order ID. To perform an INNER JOIN of the customer and order tables, we can use the following SQL statement:
This statement will select all the columns (*) from both tables and join them on the customer ID column, which is the common column between them. The result of this statement will be a new table that has seven rows and eight columns, as shown below:
The reason why there are seven rows and eight columns in the result table is because:
There are seven rows because there are six customers and six orders in the original tables, but only five customers have matching orders based on the customer ID column. Therefore, only five rows will have data from both tables, while one row will have data only from the customer table (customer 5), and one row will have no data at all (null values).
There are eight columns because there are four columns in each of the original tables, and all of them are selected and joined in the result table. Therefore, the result table will have four columns from the customer table (customer ID, first name, last name, and email) and four columns from the order table (order ID, order date, product, and quantity).
質問 # 100
An analyst needs to provide a chart to identify the composition between the categories of the survey response data set:
Which of the following charts would be BEST to use?
- A. Line
- B. Pie
- C. Histogram
- D. Waterfall
- E. Scatter pot
正解：B
解説：
Explanation
A pie chart is the best choice to show the composition between the categories of the survey response data set.
A pie chart represents the whole with a circle, divided by slices into parts. Each slice shows the relative size of each category as a percentage of the total. A pie chart is useful when the categories are mutually exclusive and add up to 100%. The table shows the favorite color and the number of responses for each color, which can be easily converted into percentages. A pie chart can show how each color contributes to the total number of responses.
Option A is incorrect because a histogram is used to show how data points are distributed along a numerical scale. The survey response data set is not numerical, but categorical.
Option C is incorrect because a line chart is used to show trends or changes over time. The survey response data set does not have a time dimension.
Option D is incorrect because a scatter plot is used to show the relationship between two numerical variables.
The survey response data set does not have two numerical variables.
Option E is incorrect because a waterfall chart is used to show how an initial value is increased or decreased by a series of intermediate values. The survey response data set does not have an initial value or intermediate values.
References:
How to Choose the Right Chart for Your Data - Infogram
How to Choose the Right Data Visualization | Tutorial by Chartio
Find the Best Visualizations for Your Metrics - The Data School
How to choose the best chart or graph for your data
質問 # 101
You are creating a dashboard that shows the total revenue for your organization broken out by a variety of factors. Which one of these is a measure, rather than a dimension?
- A. Month.
- B. Department.
- C. Revenue.
- D. Geographic region.
正解：C
質問 # 102
A data analyst needs to present the results of an online marketing campaign to the marketing manager. The manager wants to see the most important KPIs and measure the return on marketing investment. Which of the following should the data analyst use to BEST communicate this information to the manager?
- A. A real-time monitor that allows the manager to view performance the day the campaign was launched
- B. A summary with statistics, conclusions, and recommendations from the data analyst
- C. A sell-service dashboard that allows the manager to look at the company's annual budget performance
- D. A spreadsheet of the raw data from all marketing campaigns and channels
正解：B
解説：
Explanation
The option that the data analyst should use to best communicate the information to the manager is a summary with statistics, conclusions, and recommendations from the data analyst. A summary is a concise and clear way of presenting the main findings and insights from the data analysis report. A summary should include relevant statistics that support the conclusions and recommendations from the data analyst. A summary should also highlight the most important KPIs and measure the return on marketing investment in relation to the objectives of the online marketing campaign. The other options are not as effective as using a summary to communicate the information to the manager, as they either provide too much or too little information or do not address the manager's needs or expectations. A real-time monitor may provide too much information that can be overwhelming or distracting for the manager who wants to see only the most important KPIs and measure the return on marketing investment. A self-service dashboard may provide too little information that can be insufficient or unclear for the manager who wants to see some guidance and interpretation from the data analyst. A spreadsheet of raw data may provide irrelevant or inaccurate information that can be confusing or misleading for the manager who wants to see some analysis and insights from the data analyst. Reference:
[How to Write an Executive Summary for Your Data Analysis Report - Towards Data Science]
質問 # 103
'Which of the following is the BEST reason to use database views instead of tables?
- A. Views reduce the need for repetitive, complex data joins.
- B. Views can be used to restrict sensitive information.
- C. Views allow for the joining of multiple data sources, whereas tables do not.
- D. Views allow for the storage of temporary data. whereas tables do not.
正解：A
質問 # 104
What GAPP principle says that organizations should provide data subjects with the ability to review and update their personal information?
- A. Consent
- B. Access
- C. Choice
- D. Notice
正解：B
質問 # 105
Consider the following dataset which contains information about houses that are for sale:
Which of the following string manipulation commands will combine the address and region name columns to create a full address?
full_address------------------------- 85 Turner St, Northern Metropolitan 25 Bloomburg St, Northern Metropolitan 5 Charles St, Northern Metropolitan 40 Federation La, Northern Metropolitan 55a Park St, Northern Metropolitan
- A. SELECT CONCAT(regionname, '-' , address) AS full_address FROM melb LIMIT 5;
- B. SELECT CONCAT(address, ' , ' , regionname) AS full_address FROM melb LIMIT 5;
- C. SELECT CONCAT(address, '-' , regionname) AS full_address FROM melb LIMIT 5;
- D. SELECT CONCAT(regionname, ' , ' , address) AS full_address FROM melb LIMIT 5
正解：B
解説：
Explanation
The correct answer is A: SELECT CONCAT(address, ' , ' , regionname) AS full_address FROM melb LIMIT
5; String manipulation (or string handling) is the process of changing, parsing, splicing, pasting, or analyzing strings. SQL is used for managing data in a relational database. The CONCAT () function adds two or more strings together. Syntax CONCAT(stringl, string2,... string_n) Parameter Values Parameter Description stringl, string2, string_n Required. The strings to add together.
質問 # 106
Which of the ing is the correct ion for a tab-delimited spre file?
- A. tar
- B. sv
- C. tap
- D. az
正解：B
質問 # 107
A data analyst is creating a report that will provide information about various regions, products, and time periods. Which of the following formats would be the most efficient way to deliver this report?
- A. A workbook with multiple tabs for each region
- B. A dashboard with filters at the top that the user can toggle
- C. A daily email with snapshots of regional summaries
- D. A static report with a different page for every filtered view
正解：B
解説：
Explanation
The best format to deliver this report is D. A dashboard with filters at the top that the user can toggle.
A dashboard is a visual display of the most important information needed to achieve one or more objectives, consolidated and arranged on a single screen so the information can be monitored at a glance1 A dashboard with filters at the top that the user can toggle would allow the user to easily and quickly access the information they need about various regions, products, and time periods, without having to navigate through multiple tabs, pages, or emails. A dashboard with filters would also enable the user to compare and contrast different views of the data and see how they change over time. A dashboard with filters would also be more interactive and engaging than a static or email report2 A workbook with multiple tabs for each region would not be an efficient way to deliver this report, because it would require the user to switch between different tabs to see the information they need. This would make it harder to compare and contrast different regions, products, and time periods, and also increase the risk of errors or confusion. A workbook with multiple tabs would also be less visually appealing and more cluttered than a dashboard3 A daily email with snapshots of regional summaries would not be an efficient way to deliver this report, because it would limit the user's ability to explore the data in depth and customize their view. A daily email would also be dependent on the frequency and timing of the email delivery, which might not match the user's needs or preferences. A daily email would also be more likely to be ignored or deleted than a dashboard that is always accessible.
A static report with a different page for every filtered view would not be an efficient way to deliver this report, because it would create a very long and cumbersome report that would be difficult to read and understand. A static report would also not allow the user to change or update the filters as they wish, or see how the data changes over time. A static report would also be less interactive and engaging than a dashboard.
質問 # 108
A sales manager wants quarterly sales reports broken down by unit and week. Which of the following data output lists includes the most necessary information?
- A. Item name. salesperson. price. shipping cost. and date shipped
- B. Order number. salesperson. date shipped, recipient address, and price
- C. Item name, salesperson. recipient address, shipping cost. and date shipped
- D. Item number, item name, salesperson. date sold. and price
正解：D
解説：
Explanation
To create a quarterly sales report broken down by unit and week, the most necessary information is the item number, item name, salesperson, date sold, and price. These data elements can help the sales manager to track the sales volume, revenue, and performance of each unit and each week within a quarter. The item number and item name can identify the products or services sold by each unit. The salesperson can indicate the individual or team responsible for each sale. The date sold can show when each sale occurred and how it relates to the weekly and quarterly goals. The price can show how much revenue each sale generated and how it contributes to the unit and quarterly totals.
質問 # 109
Which of the following best describes the process of examining data for statistics and information about the data?
Cleansing
- A. search
- B. Governance
- C. Profiling
正解：B
解説：
Explanation
Data profiling is the process of examining data for statistics and information about the data, such as the structure, format, quality, and content of the data. Data profiling can help to understand the characteristics, patterns, relationships, and anomalies of the data, as well as to identify and resolve any errors, inconsistencies, or missing values in the data. Data profiling can be done using various tools and methods, such as spreadsheets, databases, or programming languages12.
質問 # 110
A data analyst is designing a dashboard that will provide a story of sales and determine which site is providing the highest sales volume per customer. The analyst must choose an appropriate chart to include in the dashboard. The following data is available:
Which of the following types of charts should be considered?
- A. Include a scatter chart using sales volume and average sales per customer.
- B. Include a line chart using the site and average sales per customer.
- C. Include a column chart using the site and sales to average sales per customer.
- D. Include a pie chart using the site and sales to average sales per customer.
正解：A
質問 # 111
Which of the following data sampling methods involves dividing a population into subgroups by similar characteristics?
- A. Stratified
- B. Systematic
- C. Simple random
- D. Convenience
正解：A
質問 # 112
A county in Illinois is conducting a survey to determine the mean annual income per household. The county is
427sq mi (2.65q km). Which of the following sampling methods would MOST likely result in a representative sample?
- A. A stratified phone survey of 100 people that is conducted between 2:00 p.m. and 3:00 p.m.
- B. A systematic survey that is sent to 100 single-family homes in the county
- C. Surveys sent to 100 randomly selected homes that are reflective of the population
- D. Surveys sent to ten randomly selected homes within 5mi (8km) of the county's office
正解：C
解説：
Explanation
Surveys sent to 100 randomly selected homes that are reflective of the population. This is because a random sample is a type of sample that is selected by using a random method, such as a lottery or a computer-generated number, which ensures that every element in the population has an equal chance of being selected. A random sample can result in a representative sample, which means that the sample reflects the characteristics and diversity of the population. By sending surveys to 100 randomly selected homes that are reflective of the population, the analyst can ensure that the sample is representative of the county's households and their income levels. The other sampling methods are not likely to result in a representative sample. Here is why:
A stratified phone survey of 100 people that is conducted between 2:00 p.m. and 3:00 p.m. would result in a biased sample, which means that the sample favors or excludes certain groups or elements in the population.
By conducting the survey only between 2:00 p.m. and 3:00 p.m., the analyst would miss out on people who are not available or reachable at that time, such as those who are working or sleeping. This could affect the representativeness and generalizability of the sample.
A systematic survey that is sent to 100 single-family homes in the county would result in an unrepresentative sample, which means that the sample does not reflect the characteristics and diversity of the population. By sending surveys only to single-family homes, the analyst would ignore other types of households, such as apartments, condos, or mobile homes. This could affect the accuracy and reliability of the sample.
Surveys sent to ten randomly selected homes within 5mi (8km) of the county's office would result in a small sample, which means that the sample size is too low to capture the variability and diversity of the population.
By sending surveys only to ten homes within a limited area, the analyst would miss out on many households that are located in different parts of the county. This could affect the precision and confidence of the sample.
質問 # 113
Which of the following is the correct data type for text?
- A. String
- B. Boolean
- C. Float
- D. Integer
正解：A
解説：
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
質問 # 114
You are working with a dataset and need to swap the values in rows with those in columns.
What action do you need to perform?
- A. Recording
- B. Filtering.
- C. Transposition.
- D. Aggregation.
正解：C
解説：
Transpose creates a new data file in which the rows and columns in the original data file are transposed so that cases (rows) become variables and variables (columns) become cases. Transpose automatically creates new variable names and displays a list of the new variable names.
Transposing data is useful for data analysis. At times, we have to pull data from various files with different formats for analysis and preparing reports. In such circumstances, we may have to transpose some data from one file to the other. In excel, we can transpose data in multiple ways.
質問 # 115
Which of the following actions should be taken when transmitting data to mitigate the chance of a data leak occurring? (Choose two.)
- A. Data processing
- B. Fata removal
- C. Data masking
- D. Data reporting
- E. Data encryption
- F. Data identification
正解：C、E
質問 # 116
Which one of the following tools would not be considered a fully featured analytics suite?
- A. Power BI.
- B. MicroStrategy.
- C. Minitab.
- D. Domo.
正解：C
解説：
Correct answer A. Minitab.
Power BI, Domo, and MicroStrategy are all analytics suites offering features that fill many different needs within the analytics process.
Minitab is a statistical analysis package that lacks many of these capabilities.
質問 # 117
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. ETL
- B. Data wrangling
- C. Sampling
- D. Web scraping
正解：D
質問 # 118
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