[2023年更新]DA0-001リアルな試験問題集でDA0-001練習テスト
DA0-001問題集でCompTIA Data+高確率練習問題集
CompTIA DA0-001（CompTIA Data + 認定）試験は、データ管理と分析の専門知識を証明することを望むプロフェッショナルにとっての人気のある認定試験です。この試験は、データ管理の概念、ツール、技術に関する受験者の知識、およびデータを意味のある方法で分析および解釈する能力をテストするように設計されています。
質問 # 49
Given the diagram below:
Which of the following types of sampling is depicted in the image?
- A. Cluster
- B. Systematic
- C. Stratified
- D. Random
正解：B
質問 # 50
Which one the following is not considered an aggregate function?
- A. MIN
- B. SUM
- C. MAX
- D. SELECT
正解：D
質問 # 51
Which one of the following programming languages is specifically designed for use in analytics applications?
- A. Python.
- B. C++
- C. Java.
- D. R
正解：D
質問 # 52
Given the following data tables:
Which of the following MDM processes needs to take place FIRST?
- A. Compliance with regulations
- B. Creation of a data dictionary
- C. Standardization of data field names
- D. Consolidation of multiple data fields
正解：C
質問 # 53
Given the data below:
In which of the following file formats is the data presented?
- A. RIF
- B. CSV
- C. Xs
- D. XML
正解：B
解説：
Explanation
The data is presented in a CSV (comma-separated values) file format, which is a plain text format that stores tabular data. Each line of the file is a data record, and each record consists of one or more fields separated by commas. The first line of the file usually contains the names of the fields, also known as the header. In this case, the data has four fields: Name, Age, Gender, and Occupation. Therefore, the correct answer is B.
References: CSV File (What It Is & How to Open One), Comma-separated values - Wikipedia
質問 # 54
Randy scored 76 on a math test, Katie scored 86 on a science test, Ralph scored 80 on a history test, and Jean scored 80 on an English test. The table below contains the mean and standard deviation of the scores for each of the courses:
Using this information, which of the following students had the BEST score?
- A. Katie
- B. Randy
- C. Jean
- D. Ralph
正解：A
解説：
Explanation
To compare the students' scores, we need to standardize them by using the z-score formula, which is:
z = (x - ) /
where x is the raw score, is the mean, and is the standard deviation. The z-score tells us how many standard deviations a score is above or below the mean. A higher z-score means a better score relative to the average.
Using the table, we can calculate the z-scores for each student as follows:
Randy: z = (76 - 70) / 2 = 3 Katie: z = (86 - 80) / 3 = 2 Ralph: z = (80 - 75) / 2 = 2.5 Jean: z = (80 - 90) / 1 =
-10
The student with the highest z-score is Randy, with a z-score of 3. This means that Randy scored 3 standard deviations above the mean in math, which is the best performance among the four students. Therefore, the correct answer is A.
References: Comparing with z-scores (video) | Z-scores | Khan Academy, 17 Important Data Visualization Techniques | HBS Online
質問 # 55
An analyst has conducted a review of business questions. Which of the following should the analyst do next to conduct an analysis?
- A. Determine the data needs and review the observations.
- B. Determine the data needs and begin the analysis.
- C. Determine the data needs and sources for analysis.
- D. Determine the data needs and schedule interviews.
正解：C
解説：
Explanation
After conducting a review of the business questions, the next step for the analyst is to determine the data needs and sources for analysis. This involves identifying the relevant data elements, variables, and metrics that are required to answer the business questions, as well as the data sources, formats, and quality that are available to access and use. This step will help the analyst to plan the data collection, preparation, and integration processes, as well as to assess the feasibility and limitations of the analysis1.
質問 # 56
An e-commerce company recently tested a new website layout. The website was tested by a test group of customers, and an old website was presented to a control group. The table below shows the percentage of users in each group who made purchases on the websites:
Which of the following conclusions is accurate at a 95% confidence interval?
- A. The new layout has the lowest conversion rates in the United Kingdom.
- B. In Germany, the increase in conversion from the new layout was not significant.
- C. In general, users who visit the new website are more likely to make a purchase.
- D. In France, the increase in conversion from the new layout was not significant.
正解：C
質問 # 57
You have a database where queries are performing slowly.
Investigating the results, you find that the database is performing a time-consuming table scan.
What action can best improve the query performance?
- A. Adding an index.
- B. Parameterizing the query.
- C. Sub setting the records.
- D. Recompiling the query.
正解：A
解説：
You create an index to optimize performance when searching the table using the Find function and to establish uniqueness of table columns.
Indexing makes columns faster to query by creating pointers to where data is stored within a database. Imagine you want to find a piece of information that is within a large database. To get this information out of the database the computer will look through every row until it finds it.
質問 # 58
Which of the following would a data analyst look for first if 100% participation is needed on survey results?
- A. Duplicate data
- B. Redundant data
- C. Invalid data
- D. Missing data
正解：D
解説：
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
質問 # 59
What type of policy defines an individual's responsibilities when accessing, using, sharing, and removing organizational data?
- A. Data Usage Policy.
- B. Data Integrity Policy.
- C. Privacy policy
- D. Acceptable Use Policy (AUP)
正解：D
質問 # 60
Which of the following would be considered non-personally identifiable information?
- A. Government ID number
- B. Cell phone device name
- C. Telephone number
- D. Customer's name
正解：B
質問 # 61
A data analyst must separate the column shown below into multiple columns for each component of the name:
Which of the following data manipulation techniques should the analyst perform?
- A. Concatenating
- B. Transposing
- C. Imputing
- D. Parsing
正解：D
解説：
Explanation
Parsing is the data manipulation technique that should be used to separate the column into multiple columns for each component of the name. Parsing is the process of breaking down a string of text into smaller units, such as words, symbols, or numbers. Parsing can be used to extract specific information from a text column, such as names, addresses, phone numbers, etc. Parsing can also be used to split a text column into multiple columns based on a delimiter, such as a comma, space, or dash1. In this case, the analyst can use parsing to split the column by the comma delimiter and create three new columns: one for the last name, one for the first name, and one for the middle initial. This will make the data more organized and easier to analyze.
質問 # 62
Daniel is using the structured Query language to work with data stored in relational database.
He would like to add several new rows to a database table.
What command should he use?
- A. SELECT.
- B. INSERT.
- C. UPDATE.
- D. ALTER.
正解：B
解説：
Explanation
INSERT
The INSERT command is used to add new records to a database table.
The SELECT command is used to retrieve information from a database. It's the most commonly used command in SQL because it is used to pose queries to the database and retrieve the data that you're interested in working with.
The UPDATE command is used to modify rows in the database.
The CREATE command is used to create a new table within your database or a new database on your server.
質問 # 63
When taking the test at home, how much extra time is allowed compared to the in-person test?
- A. 15 minutes
- B. 10 minutes
- C. None.
- D. 30 minutes
正解：C
質問 # 64
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