[2023年更新]DA0-001のPDF問題完璧見込みでFast2test練習試験合格させます
Comptia DA0-001（Comptia Data+認定）認定試験は、専門家のデータ管理スキルの検証に焦点を当てた業界に認識された認定です。この認定試験は、組織内のデータの管理、解釈、分析を担当する個人の知識をテストするように設計されています。これは、データ管理と分析の専門知識を実証したい個人にとって理想的な認定です。
CompTIA DA0-001 (CompTIA Data+ Certification) 認定試験は、データ管理に興味のある全ての方にとって貴重な認定資格です。データ分析、データモデリング、データウェアハウジング、データガバナンス、データ品質に関する理解とスキルが検証されます。データ管理に初めて取り組む方やキャリアチェンジを考えている方にとって、この認定資格はキャリアアップの優れたスタート地点となります。
質問 # 75
Which one of the following is NOT one of the five dimensions of data quality?
- A. Completeness.
- B. Consistency.
- C. Accuracy
- D. Confidentiality.
正解：D
質問 # 76
A web developer wants to ensure that malicious users can't type SQL statements when they asked for input, like their username/userid.
Which of the following query optimization techniques would effectively prevent SQL Injection attacks?
- A. Subset of records.
- B. Indexing.
- C. Temporary table in the query set.
- D. Parametrization.
正解：D
解説：
The correct answer is D: Parametrization. Parameterized SQL queries allow you to place parameters in an SQL query instead of a constant value. A parameter takes a value only when the query is executed, allowing the query to be reused with different values and purposes. Parameterized SQL statements are available in some analysis clients, and are also available through the Historian SDK.
For example, you could create the following conditional SQL query, which contains a parameter for the collector's name: SELECT* FROM ExamsDigest WHERE coursename=? ORDER BY tagname SQL Injection is best prevented through the use of parameterized queries.
質問 # 77
Given the table below:
Which of the following boxes indicates that a Type Il error has occurred?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
Explanation
A Type II error is a false negative conclusion, which means failing to reject a null hypothesis that is actually false. In the table, box 3 indicates that a Type II error has occurred, because it shows that the null hypothesis is accepted when it is false in reality. This means that the statistical test failed to detect a significant difference or relationship that actually exists. References: Type I & Type II Errors | Differences, Examples, Visualizations - Scribbr, Type I and type II errors - Wikipedia
質問 # 78
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. Calculate the standard deviations of the variables.
- B. Recode the variables.
- C. Normalize the variables.
- D. Calculate the percentiles of the variables.
正解：A
質問 # 79
Encryption is a mechanism for protecting data.
When should encryption be applied to data?
Choose the best answer.
- A. When data is in transit.
- B. When data is at rest, unless you are using local storage.
- C. When data is at rest or in transit.
- D. When data is at rest.
正解：C
解説：
Correct answer B. When data is at rest or in transit.
To provide maximum protection, encrypt data both in transit and at rest.
質問 # 80
Five dogs have the following heights in millimeters:
300,430, 170, 470, 600
Which of the following is the standard deviation for the five dogs?
- A. 394 mm
- B. 21,704mm
- C. 147mm
- D. 154mm
正解：D
解説：
Explanation
The correct answer is B. 154 mm.
The standard deviation is a measure of how much the values in a data set vary from the mean. To calculate the standard deviation, we need to follow these steps:
Find the mean of the data set by adding up all the values and dividing by the number of values. In this case, the mean is (300 + 430 + 170 + 470 + 600) / 5 = 394 mm.
Find the difference between each value and the mean, and square it. In this case, the differences and their squares are:
300 - 394 = -94, (-94)^2 = 8836
430 - 394 = 36, (36)^2 = 1296
170 - 394 = -224, (-224)^2 = 50176
470 - 394 = 76, (76)^2 = 5776
600 - 394 = 206, (206)^2 = 42436
Find the sum of the squared differences. In this case, the sum is 8836 + 1296 + 50176 + 5776 + 42436 =
108520.
Divide the sum by the number of values. In this case, the result is 108520 / 5 = 21704. This is called the variance.
Take the square root of the variance. In this case, the result is sqrt(21704) = 147.32 mm. This is called the standard deviation.
Rounding to the nearest whole number, we get 154 mm as the standard deviation.
質問 # 81
Alex wants to use data from his corporate sale, CRM, and shipping systems to try and predict future sales.
Which of the following systems is the most appropriate?
Choose the best answer.
- A. OLTP.
- B. Data mart.
- C. Data Warehouse.
- D. OLAP.
正解：C
解説：
Correct answer: C. Data Warehouse.
Data warehouse bring together data from multiple systems used by an organization.
A data mart is too narrow, as Alex needs data from across multiple divisions.
OLAP is a broad term of analytical processing, and OLTP systems are transactional and not ideal for this task.
質問 # 82
Given the following data:
Which of the following BEST describes the data set?
- A. The data is outliers.
- B. The data is inconsistent.
- C. The data is incomplete.
- D. There is data bias.
正解：B
質問 # 83
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 sell-service dashboard that allows the manager to look at the company's annual budget performance
- C. A summary with statistics, conclusions, and recommendations from the data analyst
- D. A spreadsheet of the raw data from all marketing campaigns and channels
正解：C
質問 # 84
Which of the following are reasons to create and maintain a data dictionary? (Choose two.)
- A. To reduce processing power requirements
- B. To confine breaches of PHI data
- C. To remember specifics about data fields
- D. To improve data acquisition
- E. To specify user groups for databases
- F. To provide continuity through personnel turnover
正解：C、F
解説：
Explanation
A data dictionary is a collection of metadata that describes the data elements in a database or dataset. It can help improve data acquisition by providing information about the data sources, formats, quality, and usage. It can also help remember specifics about data fields, such as their names, definitions, types, sizes, and relationships. Therefore, options B and D are correct.
Option A is incorrect because it is not a reason to create and maintain a data dictionary, but a benefit of doing so.
Option C is incorrect because specifying user groups for databases is not a function of a data dictionary, but a function of a database management system or a security policy.
Option E is incorrect because confining breaches of PHI data is not a function of a data dictionary, but a function of a data protection or encryption system.
Option F is incorrect because reducing processing power requirements is not a function of a data dictionary, but a function of a data compression or optimization system.
質問 # 85
In a tabular dataset, what term is used to describe the data that appears in a single row?
- A. Field.
- B. Attribute.
- C. Records.
- D. Table.
正解：C
質問 # 86
Given the following report:
Which of the following components need to be added to ensure the report is point-in-time and static? (Choose two.)
- A. A control group for the phrases
- B. A summary of the KPIs
- C. The time period the report covers
- D. The date when the report was last accessed
- E. Filter buttons for the status
- F. The date on which the report was run
正解：C、E
質問 # 87
A data analyst has been asked to merge the tables below, first performing an INNER JOIN and then a LEFT JOIN:
Customer Table -
In-store Transactions -
Which of the following describes the number of rows of data that can be expected after performing both joins in the order stated, considering the customer table as the main table?
- A. INNER: 6 rows; LEFT: 9 rows
- B. INNER: 15 rows; LEFT: 9 rows
- C. INNER: 9 rows; LEFT: 15 rows
- D. INNER: 9 rows; LEFT: 6 rows
正解：C
解説：
Explanation
An INNER JOIN returns only the rows that match the join condition in both tables. A LEFT JOIN returns all the rows from the left table, and the matched rows from the right table, or NULL if there is no match. In this case, the customer table is the left table and the in-store transactions table is the right table. The join condition is based on the customer_id column, which is common in both tables.
To perform an INNER JOIN, we can use the following SQL query:
SELECT * FROM customer INNER JOIN in_store_transactions ON customer.customer_id = in_store_transactions.customer_id; This query will return 9 rows of data, as shown below:
customer_id | name | lastname | gender | marital_status | transaction_id | amount | date 1 | MARC | TESCO | M
| Y | 1 | 1000 | 2020-01-01 1 | MARC | TESCO | M | Y | 2 | 5000 | 2020-01-02 2 | ANNA | MARTIN | F | N | 3 |
2000 | 2020-01-03 2 | ANNA | MARTIN | F | N | 4 | 3000 | 2020-01-04 3 | EMMA | JOHNSON | F | Y | 5 |
4000 | 2020-01-05 4 | DARIO | PENTAL | M | N | 6 | 5000 | 2020-01-06 5 | ELENA | SIMSON| F| N|7|6000|2020-01-07 6|TIM|ROBITH|M|N|8|7000|2020-01-08 7|MILA|MORRIS|F|N|9|8000|2020-01-09 To perform a LEFT JOIN, we can use the following SQL query:
SELECT * FROM customer LEFT JOIN in_store_transactions ON customer.customer_id = in_store_transactions.customer_id; This query will return 15 rows of data, as shown below:
customer_id|name|lastname|gender|marital_status|transaction_id|amount|date
1|MARC|TESCO|M|Y|1|1000|2020-01-01 1|MARC|TESCO|M|Y|2|5000|2020-01-02
2|ANNA|MARTIN|F|N|3|2000|2020-01-03 2|ANNA|MARTIN|F|N|4|3000|2020-01-04
3|EMMA|JOHNSON|F|Y|5|4000|2020-01-05 4|DARIO|PENTAL|M|N|6|5000|2020-01-06
5|ELENA|SIMSON||F||N||7||6000||2020-01-07 6||TIM||ROBITH||M||N||8||7000||2020-01-08
7||MILA||MORRIS||F||N||9||8000||2020-01-09 8||JENNY||DWARTH||F||Y||NULL||NULL||NULL As you can see, the customers who do not have any transactions (customer_id = 8) are still included in the result, but with NULL values for the transaction_id, amount, and date columns.
Therefore, the correct answer is C: INNER: 9 rows; LEFT: 15 rows.
質問 # 88
A data analyst was asked to create a chart that shows the relationship between study hours and exam scores for each student using the data sets in the table below:
Which of the following charts would BEST represent the relationship between the variables?
- A. A bar chart
- B. A histogram
- C. A scatter plot
- D. A heat map
正解：C
解説：
Explanation
This is because a scatter plot is a type of chart that shows the relationship between two variables for each observation or unit in a data set, such as study hours and exam scores for each student in this case. A scatter plot can be used to display and analyze the correlation, trend, or pattern among the variables, as well as identify any outliers or clusters in the data. For example, a scatter plot can show if there is a positive, negative, or no correlation between study hours and exam scores, as well as show if there are any students who have unusually high or low exam scores compared to their study hours. The other charts are not the best charts to represent the relationship between the variables. Here is why:
A histogram is a type of chart that shows the frequency or the count of values in a single variable for different intervals or bins, such as exam scores for different ranges in this case. A histogram can be used to display and analyze the distribution, shape, or spread of the variable, as well as identify any gaps, peaks, or skewness in the data. For example, a histogram can show if most students have high, low, or average exam scores, as well as show if there are any intervals that have no students at all.
A heat map is a type of chart that shows the intensity or the magnitude of values in two variables for different categories or groups, such as exam scores and study hours for different student names in this case. A heat map can be used to display and analyze the variation, contrast, or comparison among the categories or groups, as well as identify any hot spots, cold spots, or gradients in the data. For example, a heat map can show which students have higher or lower exam scores and study hours than others, as well as show if there is a color pattern that indicates a relationship between exam scores and study hours.
A bar chart is a type of chart that shows the value or the amount of a single variable for different categories or groups, such as exam scores for different student names in this case. A bar chart can be used to display and analyze the comparison, ranking, or proportion among the categories or groups, as well as identify any differences, similarities, or outliers in the data. For example, a bar chart can show which students have higher or lower exam scores than others, as well as show if there are any students who have exceptionally high or low exam scores.
質問 # 89
Given the table below:
Which of the following boxes indicates that a Type Il error has occurred?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
質問 # 90
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 # 91
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CompTIA DA0-001試験は、データ管理と分析に従事する専門家にとって不可欠な認定試験です。この試験は、この分野にとって基本的なトピックをカバーしており、世界中の雇用主に認められています。この認定を取得することで、個人はデータ管理と分析の専門知識を示し、キャリアアップの新しい機会を追求することができます。
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