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QUESTION 72
A data analyst wants to create “Income Categories” that would be calculated based on the existing variable “Income”. The “Income Categories” would be as follows:
Income category 1: less than $1.
Income category 2: more than $1 and less than $20,000.
Income category 3: more than $20,001 and less than $40,000.
Income category 4: more than $40,001.
Which of the following data manipulation techniques should the data analyst use to create “Income Categories”?

Data merge

Derived variables

Data blending

Data append

The correct answer is B: Derived variables Derived variables are variables that you create by calculating or categorizing variables that already exist in your data set.
Data merge is incorrect. Data merging is the process of combining two or more data sets into a single data set. Data blending is incorrect.
Data blending involves pulling data from different sources and creating a single, unique, dataset for visualization and analysis.
Data append is incorrect. A data append is a process that involves adding new data elements to an existing database.

QUESTION 73
Which one of the following tools would not be considered a fully featured analytics suite?

Minitab.

MicroStrategy.

Domo.

Power BI.

Correct answer A. Minitab.
Power BI, Domo, and MicroStrategy are all analytics suites offering features that fill many different needs within the analytics process.
Minitab is a statistical analysis package that lacks many of these capabilities.

QUESTION 74
Q3 2020 has just ended, and now a data analyst needs to create an ad-hoc sales report that demonstrates how well the Q3 2020 promotion went versus last year’s Q3 promotion.
Which of the following date parameters should the analyst use?

2019 vs. YTD 2020

Q3 2019 vs. Q3 2020

YTD 2019 vs. YTD 2020

Q4 2019 vs. Q3 2020

QUESTION 75
You would like to measure how well an organization is achieving its goals.
What type of analysis should you perform?

Performance analysis.

Outlier analysis.

Predictive analysis.

Trend analysis.

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.

QUESTION 76
A junior web developer is developing a new application where users can upload short videos. The first task is to create a homepage that shows the headline “Upload Your Short Videos” and a clickable button that says “upload now”.
Which of the following HTML commands would help the developer to complete the task successfully?

< span >Upload Your Short Videos< /span >< button >upload now< /button >

< p >Upload Your Short Videos< /p >< p >upload now< /p >

< hl >Upload Your Short Videos< /h1 >< button >upload now< /button >

< hl >Upload Your Short Videos< /h1 >< hl >upload now< /h1 >

The correct answer is: Upload Your Short Videos
upload now
The two tags are used to define HTML headings. defines the most important heading. defines the least important heading.
Note: Only use one per page – this should represent the main heading/subject for the whole page. The tag defines a clickable button.

QUESTION 77
A data analyst has been asked to create an ad-hoc sales report for the Chief Executive Officer (CEO).
Which of the following should be included in the report?

The sales representatives’ home addresses.

Line-item SKU numbers.

YTD total sales.

The customers’ first and last names.

QUESTION 78
Which one of the following values would not be appropriately stored in integer data type?

-16

10921

1.2

QUESTION 79
Which of the following roles is responsible for ensuring an organization’s data quality, security, privacy, and regulatory compliance?

Data owner.

Data steward.

Data custodian.

Data processor.

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.

QUESTION 80
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.

Data mart.

OLAP.

Data Warehouse.

OLTP.

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.

QUESTION 81
What is the maximum number of values that may be assigned to a single key in a key/value store?

No maximum

QUESTION 82
Encryption is a mechanism for protecting data.
When should encryption be applied to data?
Choose the best answer.

When data is at rest.

When data is at rest or in transit.

When data is in transit.

When data is at rest, unless you are using local storage.

Correct answer B. When data is at rest or in transit.
To provide maximum protection, encrypt data both in transit and at rest.

QUESTION 83
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?

Sub setting the records.

Parameterizing the query.

Recompiling the query.

Adding an index.

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.

QUESTION 84
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 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.

QUESTION 85
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?

Percent deviation.

Percent difference.

Percent variance.

Percent change.

QUESTION 86
Which one of the following would not normally be considered a summary statistic?

z-score.

Mean.

Variance.

Standard deviation.

Simply put, a z-score (also called a standard score) gives you an idea of how far from the mean a data point is. But more technically it’s a measure of how many standard deviations below or above the population mean a raw score is. A z-score can be placed on a normal distribution curve.

QUESTION 87
Which of the following should be accomplished NEXT after understanding a business requirement for a data analysis report?

Rephrase the business requirement.

Determine the data necessary for the analysis

Build a mock dashboard/presentation layout.

Perform exploratory data analysis.

QUESTION 88
What is the median of the following numbers?
13, 2, 65, 3, 5, 4, 7, 3, 4, 7, 8, 2, 4, 4, 60, 23, 43, 2

4.5

Correct answer B. 4.5
To find the median, sort the numbers in your dataset and find the one located in the middle. In this case, there are an even number of observations, so we take the two middle numbers (4 and 5) and use their average as the median, making the median value 4.5.
The mode is 4, the range is 63, and the number of observations is 18.

QUESTION 89
Most data that exists in the world is structured data.

True

False

QUESTION 90
Which of the following is the correct data type for text?

Boolean

String

Integer

Float

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2022 Updated Verified Pass DA0-001 Exam – Real Questions & Answers [Q72-Q90]

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What are the advantages of obtaining CompTIA DA0-001 Certification