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For which of the following test statistics would a low value imply a potentially meaningful result?
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B
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Explanation
In hypothesis testing, the p-value represents the probability of observing a test statistic at least as extreme as the one observed, assuming the null hypothesis is true. Key idea: A low p-value (typically below a chosen significance level such as 0.05): Indicates that the observed result is unlikely under the null hypothesis. Suggests there is evidence against the null hypothesis. Is therefore interpreted as potentially meaningful / statistically significant. By contrast: The test statistics themselves (e.g., t-statistic, F-statistic, chi-square) are usually interpreted such that larger absolute values indicate stronger evidence against the null (and lead to smaller p-values). The question explicitly asks which test statistic shows that a low value implies meaningful result — that is p-value, which is itself a probability metric used to evaluate significance. Therefore, the correct choice is p-value (B). CompTIA Data+ Reference (concept alignment): DA0-001 Exam Objectives – Statistical methods: hypothesis testing, p-values, significance. Study materials: explanation that small p-values indicate statistically significant results. |
An analyst has received the requirements for an internal user dashboard. The analyst confirms the data sources and then creates a wireframe. Which of the following is the NEXT step the analyst should take in the dashboard creation process?
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C
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Explanation
Getting stakeholder approval is the next step the analyst should take in the dashboard creation process, after confirming the data sources and creating a wireframe. Stakeholder approval means getting feedback and validation from the intended users or clients of the dashboard, to ensure that it meets their expectations and requirements. This step helps to avoid rework and ensure customer satisfaction. References: CompTIA Data+ Certification Exam Objectives, page 14 |
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?
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C
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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. [Reference: SQL Joins - W3Schools, , , ]
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Find answers to the most common questions about the CompTIA DA0-001 exam, including what it is, how to prepare, and how it can boost your career.
The CompTIA DA0-001 certification is a globally-acknowledged credential that is awarded to candidates who pass this certification exam by obtaining the required passing score. This credential attests and validates the candidates' knowledge and hands-on skills in domains covered in the CompTIA DA0-001 certification syllabus. The CompTIA DA0-001 certified professionals with their verified proficiency and expertise are trusted and welcomed by hiring managers all over the world to perform leading roles in organizations. The success in CompTIA DA0-001 certification exam can be ensured only with a combination of clear knowledge on all exam domains and securing the required practical training. Like any other credential, CompTIA DA0-001 certification may require periodic renewal to stay current with new innovations in the concerned domains.