[Jan-2023] DA0-001 exam torrent CompTIA study guide
Use Valid New DA0-001 Test Notes & DA0-001 Valid Exam Guide
NEW QUESTION 22
A table in a hospital database has a column for patient height in inches and a column for patient height in centimeters. This is an example of:
- A. duplicate data.
- B. invalid data
- C. dependent data.
- D. redundant data
Answer: D
NEW QUESTION 23
How many variables are normally shown on a standard heat map?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 24
What R package makes it easy to work with dates?
- A. Lubridate.
- B. ggplot.
- C. Stringr.
- D. Datemath.
Answer: A
Explanation:
Lubridate is an R package that makes it easier to work with dates and times.
NEW QUESTION 25
Mario works with a group of R programmers tasked with copying data from an accounting system into a data warehouse.
In what phase are the group's R skills most relevant?
- A. Purge.
- B. Extract.
- C. Transform.
- D. Load.
Answer: C
NEW QUESTION 26
Which of the following describes a programming language and free software environment for statistical computing and graphics?
- A. SAS.
- B. R.
- C. Microsoft Power BI.
- D. Microsoft Excel.
Answer: B
NEW QUESTION 27
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. ALTER.
- B. SELECT.
- C. UPDATE.
- D. INSERT.
Answer: D
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.
NEW QUESTION 28
What GAPP principle says that organizations should provide data subjects with the ability to review and update their personal information?
- A. Choice
- B. Notice
- C. Access
- D. Consent
Answer: C
NEW QUESTION 29
Olivia has 15 people on her data analytics team. Her team's charter requires that all team members have read access to the finance, human resources, sales, and customer service areas of the corporate data warehouse.
What is the best way to provision access to her team?
Choose the best answer.
- A. Since there are four discrete data subjects, create one role for each subject area.
- B. Enable multifactor authentication (MFA) to protect the data.
- C. Since there are 15 people on her team, create a role for each person to improve security.
- D. Create a single role that includes finance, human resources, sales, and customer services data.
Answer: D
Explanation:
Correct answer D. Create a single role that includes finance, human resources, sales, and customer services data.
While MFA is a good security practice, it doesn't govern access to data.
Creating a single role for her team and assigning that role to the individuals on the team is the best approach.
NEW QUESTION 30
What internal document explains privacy responsibilities to employees who will handle personally identifiable information?
- A. Privacy policy
- B. Acceptable use policy
- C. Integrity policy
- D. Security policy
Answer: B
NEW QUESTION 31
What feature varies on a bubble chart but not on a scatter plot?
- A. Color
- B. X-position
- C. Y-position
- D. Size
Answer: D
NEW QUESTION 32
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 difference.
- B. Percent variance.
- C. Percent deviation.
- D. Percent change.
Answer: D
NEW QUESTION 33
Different people manually type a series of handwritten surveys into an online database. Which of the following issues will MOST likely arise with this data? (Choose two.)
- A. Data constraints
- B. Data bias
- C. Data accuracy
- D. Data attribute limitations
- E. Data manipulation
- F. Data consistency
Answer: C,E
NEW QUESTION 34
What type of report is commonly used to make operational decisions?
- A. Research
- B. Compliance
- C. Tactical
- D. Strategic
Answer: C
NEW QUESTION 35
What data type is most appropriate for storing postal codes, such as, U.S. ZIP codes?
- A. Integer.
- B. Float.
- C. Location.
- D. String.
Answer: D
NEW QUESTION 36
An analyst runs a report on a daily basis, and the number of datapoints must be validated before the data can be analyzed. The number of datapoints increases each day by approximately 20% of the total number from the day before. On a given day, the number of datapoints was 8,798. Which of the following should be the total number of datapoints on the next day?
- A. 10,600
- B. 10,800
- C. 7,038
- D. 9,600
Answer: C
NEW QUESTION 37
Which of the following describes the method of sampling in which elements of data are selected randomly from each of the small subgroups within a population?
- A. Simple random
- B. Cluster
- C. Systematic
- D. Stratified
Answer: C
NEW QUESTION 38
When analyzing the values of two variables, you decide to convert both variables so they are on a scale of 0 to 1.
What term describes this action?
- A. Aggregation.
- B. Transposition.
- C. Filtering.
- D. Normalization.
Answer: D
Explanation:
Normalization is the process of reorganizing data in a database so that it meets two basic requirements: There is no redundancy of data, all data is stored in only one place. Data dependencies are logical, all related data items are stored together.
Put simply, data normalization ensures that your data looks, reads, and can be utilized the same way across all of the records in your customer database. This is done by standardizing the formats of specific fields and records within your customer database.
NEW QUESTION 39
The category PII (Personally identifiable information) includes all of the following, except_________.
- A. Trade secrets.
- B. Medical records.
- C. Financial information.
- D. Browsing habits.
Answer: A
NEW QUESTION 40
Consider this dataset showing the retirement age of 11 people, in whole years:
54, 54, 54, 55, 56, 57, 57, 58, 58, 60, 60
This tables show a simple frequency distribution of the retirement age data.
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
A measure of central tendency (also referred to as measures of centre or central location) is a summary measure that attempts to describe a whole set of data with a single value that represents the middle or centre of its distribution.
There are three main measures of central tendency: the mode, the median and the mean. Each of these measures describes a different indication of the typical or central value in the distribution.
What is the mode?
The mode is the most commonly occurring value in a distribution.
The most commonly occurring value is 54, therefore the mode of this distribution is 54 years.
NEW QUESTION 41
Which of the following would be used to store unstructured data from different sources?
- A. A data lake
- B. A database management system
- C. A data warehouse
- D. A database
Answer: A
NEW QUESTION 42
A recurring event is being stored in two databases that are housed in different geographical locations. A data analyst notices the event is being logged three hours earlier in one database than in the other database. Which of the following is the MOST likely cause of the issue?
- A. The data analyst is not querying the databases correctly.
- B. The databases are recording the event in different time zones.
- C. The second database is logging incorrectly.
- D. The databases are recording different events.
Answer: B
NEW QUESTION 43
Given the following graph:
Which of the following summary statements upholds integrity in data reporting?
- A. Sales are approximately equal for Product A and Product B across all strategies.
- B. Strategy 4 provides the best sales in comparison to other strategies.
- C. Product D should be promoted more than the other products in all strategies.
- D. While Strategy 2 does not result in the highest sales of Product D, over all products it appears to be the most effective.
Answer: B
NEW QUESTION 44
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