[Jul-2022] DA0-001 exam torrent CompTIA study guide
Use Valid New DA0-001 Test Notes & DA0-001 Valid Exam Guide
NEW QUESTION 46
Which one of the following is not a good example of discrete data type?
- A. Attendees at a meeting.
- B. Years of experience.
- C. Number of children.
- D. Temperature of a room.
Answer: D
NEW QUESTION 47
Analyzing a data point, you find that the point is 1 standard deviation above the mean.
What is the z-score for this data point?
- A. 0
- B. 1
- C. 0.5
- D. -0.5
Answer: A
NEW QUESTION 48
How should data classifications be assigned?
- A. According to sensitivity and criticality.
- B. According to criticality.
- C. According to sensitivity.
- D. According to sensitivity, criticality and age.
Answer: A
NEW QUESTION 49
What internal document explains privacy responsibilities to employees who will handle personally identifiable information?
- A. Privacy policy
- B. Acceptable use policy
- C. Security policy
- D. Integrity policy
Answer: B
NEW QUESTION 50
Kelly wants to get feedback on the final draft of a strategic report that has taken her six months to develop.
What can she do to get prevent confusion as see seeks feedback before publishing the report?
Choose the best answer.
- A. Publish the report on an internally facing website.
- B. Show the report to her immediate supervisor.
- C. Use a watermark to identify the report as a draft.
- D. Distribute the report to the appropriate stakeholders via email.
Answer: C
Explanation:
While Kelly needs feedback from the appropriate stakeholders, doing so without a watermark could lead them to believe the report they receive is the final product.
NEW QUESTION 51
You are measuring how much a child has grown over the past year and would like to express that using a percentage.
What calculation is most appropriate?
- A. Percent change.
- B. Percent deviation.
- C. Percent variance.
- D. Percent difference.
Answer: A
NEW QUESTION 52
Which of the following is a common data analytics tool that is also used as an interpreted, high-level, general-purpose programming language?
- A. SAS
- B. Microsoft Power B1
- C. IBM SPSS
- D. Python
Answer: D
NEW QUESTION 53
Data stewards protect the organization from legal violations that may result in costly fines and negative publicity.
- A. False.
- B. True.
Answer: B
NEW QUESTION 54
What is the most time-consuming of the practices that authorize international data transfers under GDPR?
- A. Standard contractual clauses.
- B. Memoranda of understanding.
- C. Privacy shield.
- D. Binding corporate rules.
Answer: D
NEW QUESTION 55
Samantha needs to share a list of her organization's top 50 customers with the VP of sales.
She would like to include the name of the customer, the business they represent, their contact information, and their total sales over the past year.
The VP does not have any specialized analytics skills or software but would like to make some personal notes on the dataset.
What would be the best tool for Samantha to use to share this information?
- A. SAS.
- B. Power BI.
- C. Microsoft Excel.
- D. Minitab.
Answer: C
Explanation:
Microsoft Excel.
This scenario presents a very simple use case where the business leader needs a dataset in an easy-to-access form and will not be performing any detailed analysis.
A simple spreadsheet, such as Microsoft Excel, would be the best tool for this job.
There is no need to use a statistical analysis package, such as SAS or Minitab, as this would likely confuse the VP without adding any value. The same is true of an integrated analytics suite, such as Power BI.
NEW QUESTION 56
Which of the following can be used to translate data into another form so it can only be read by a user who has a key or a password?
- A. Data encryption.
- B. Data transmission.
- C. Data masking.
- D. Data protection.
Answer: A
Explanation:
Data encryption is a way of translating data from plaintext (unencrypted) to ciphertext (encrypted). Users can access encrypted data with an encryption key and decrypted data with a decryption key.
NEW QUESTION 57
Which dimension of data quality ensures that data stored in multiple locations is the same?
- A. Accuracy.
- B. Consistency.
- C. Completeness.
- D. Validity.
Answer: B
Explanation:
Data consistency means that each user sees a consistent view of the data, including visible changes made by the user's own transactions and transactions of other users.
NEW QUESTION 58
Andrew conducts a study and wants to capture eye color.
What kind of data is eye color?
Choose the best response.
- A. Alphanumeric.
- B. Discrete.
- C. Categorical.
- D. Continuous.
Answer: C
Explanation:
Correct answer B. Categorical.
Eye color can only fall into a certain range of values; as such, it is categorical.
NEW QUESTION 59
The ACME Corporation hired an analyst to detect data quality issues in their excel documents. Which of the following are the most common issues? (Select TWO)
- A. Duplicates.
- B. Misspellings.
- C. Apostrophe.
- D. Symbols.
- E. Commas.
Answer: A,B
Explanation:
1. Duplicates
2. Misspellings
The most common data quality issues are difficult to resolve in Excel because of their rigidity. It forces analysts to do a ton of manual work, which results in a high probability of an error being introduced to the data set. Those common issues include:
- Blanks
- Nulls
- Outliers
- Duplicates
- Extra spaces
- Misspellings
- Abbreviations and domain-specific variations
- Formula error codes
When introduced, these errors can skew or even invalidate the resulting analysis. A smart tool would minimize the possibility of error by automating the manual work. In Excel, you might look for data quality issues in one of two ways. First, you might use auto filters on specific columns to scan for anomalies and blanks or you might use a pivot table to find gaps and discrepancies.
In either case, you're scanning for the anomalies yourself. Suffice it to say that's not a very efficient process. It also means accuracy is only as good as the analyst's eye, so the probability of error varies throughout the day.
NEW QUESTION 60
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. Recompiling the query.
- B. Adding an index.
- C. Parameterizing the query.
- D. Sub setting the records.
Answer: B
Explanation:
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.
NEW QUESTION 61
A data analyst for a media company needs to determine the most popular movie genre. Given the table below:
Which of the following must be done to the Genre column before this task can be completed?
- A. Merge
- B. Concatenate
- C. Append
- D. Delimit
Answer: D
NEW QUESTION 62
You would like to measure how well an organization is achieving its goals.
What type of analysis should you perform?
- A. Trend analysis.
- B. Outlier analysis.
- C. Predictive analysis.
- D. Performance analysis.
Answer: D
Explanation:
Performance analysis is the technique of studying or comparing the performance of a specific situation in contrast to the aim and yet executed. In Human Resource, performance analysis can help to review an employee's contribution towards a project or assignment, which they allotted him or her.
NEW QUESTION 63
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. Temporary table in the query set.
- C. Indexing.
- D. Parametrization.
Answer: D
Explanation:
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.
NEW QUESTION 64
When taking the test at home, how much extra time is allowed compared to the in-person test?
- A. None.
- B. 30 minutes
- C. 10 minutes
- D. 15 minutes
Answer: A
NEW QUESTION 65
Encryption is a mechanism for protecting data.
When should encryption be applied to data?
Choose the best answer.
- A. When data is at rest, unless you are using local storage.
- B. When data is at rest or in transit.
- C. When data is in transit.
- D. When data is at rest.
Answer: B
Explanation:
Correct answer B. When data is at rest or in transit.
To provide maximum protection, encrypt data both in transit and at rest.
NEW QUESTION 66
You have two databases tables that you would like to join together using a foreign key relationship.
What term best describes this action?
- A. Merging.
- B. Mixing.
- C. Appending.
- D. Blending.
Answer: A
Explanation:
Data merging is the process of combining two or more data sets into a single data set. Most often, this process is necessary when you have raw data stored in multiple files, worksheets, or data tables, that you want to analyze all in one go.
NEW QUESTION 67
Which of the following roles is responsible for ensuring an organization's data quality, security, privacy, and regulatory compliance?
- A. Data custodian.
- B. Data processor.
- C. Data owner.
- D. Data steward.
Answer: D
Explanation:
Correct answer B. Data steward.
A data steward is responsible for leading an organization's data governance activities, which include data quality, security, privacy, and regulatory compliance.
NEW QUESTION 68
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(regionname, '-' , address) AS full_address FROM melb LIMIT 5;
- D. SELECT CONCAT(address, '-' , regionname) AS full_address FROM melb LIMIT 5;
Answer: B
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.
NEW QUESTION 69
Analyze the values of X shown below
(2,2,5,6,7)
What is the modal value?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 70
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. Scatter pot
- B. Line
- C. Histogram
- D. Pie
- E. Waterfall
Answer: D
NEW QUESTION 71
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