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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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CompTIA Data+ Certification Exam Sample Questions (Q323-Q328):

NEW QUESTION # 323
During data profiling, an analyst decides to recode the status column in the following data set:

Which of the following data concerns explains why the analyst wants to take this action?

A. Invalidity
B. Redundancy
C. Duplication
D. Inconsistency

Answer: D

Explanation:
The 'Status' column in the dataset shows different terms such as "yes", "completed", "done", and "Y" that likely represent the same outcome - that a task has been completed. This variation in terms leads to inconsistency within the data. Data profiling aims to ensure that data is consistent, among other quality metrics, to facilitate accurate analysis and reporting. By recoding the 'Status' column, the analyst seeks to address this inconsistency, ensuring that all entries indicating completion are represented uniformly. This enhances the data quality and usability for subsequent data analysis tasks.Reference:
The action of recoding is taken to standardize the data entries and eliminate inconsistencies, which is crucial for maintaining data integrity and ensuring reliable data analysis.

NEW QUESTION # 324
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: 9 rows; LEFT: 15 rows
C. INNER: 15 rows; LEFT: 9 rows
D. INNER: 9 rows; LEFT: 6 rows

Answer: B

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.

NEW QUESTION # 325
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 an initial analysis and use a Pareto chart.
B. Conduct a link analysis and illustrate the connection points.
C. Conduct a trend analysis and use a scatter chart.
D. Conduct an exploratory analysis and use descriptive statistics.

Answer: D

NEW QUESTION # 326
Given the following data:

Which of the following BEST describes the data set?

A. The data is outliers.
B. The data is incomplete.
C. The data is inconsistent.
D. There is data bias.

Answer: C

NEW QUESTION # 327
Which of the following reports can be used when insight into operational performance is needed each Wednesday?

A. Tactical report
B. Static report
C. Recurring report
D. Ad hoc report

Answer: C

NEW QUESTION # 328
......

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