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DA0-001 Practice Questions

Question # 1
A data analyst needs to create a data visualization that aids in un the cumulative impact of sequentially introduced values that are positive or negative. Which of the following data visualization methods should the analyst use?
A. A bubble chart
B. A waterfall chart
C. A scatter plot
D. A line chart


B. A waterfall chart

Explanation: A waterfall chart is a type of data visualization that shows the cumulative impact of sequentially introduced values that are positive or negative. A waterfall chart typically has an initial value and a final value, with intermediate values shown as floating columns that either add to or subtract from the initial value. A waterfall chart can help visualize how different factors contribute to a net change in a value over time. Therefore, the correct answer is B.

Question # 2
A gambler thinks that a coin is fair and is equally likely to turn up heads or tails when the coin is flipped. Which of the following tests should the gambler use to fest this hypothesis?
A. t-test
B. Chi-squared test
C. Rank sum test
D. Ratio test


B. Chi-squared test


Question # 3
A client has requested an analysis of all pet care items purchased by current customers and their social media connections in the past 12 months. Which of the following data analysis techniques would be the best choice given these requirements?
A. Trend analysis
B. Performance analysis
C. Link analysis
D. Exploratory data analysis


C. Link analysis


Question # 4
Analytics reports should follow corporate style guidelines.
A. True
B. False


A. True


Question # 5
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 protection.
D. Data masking.


A. Data encryption.

Explanation:  Data encryption 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. Data encryption is a process of transforming data using an algorithm or a cipher to make it unreadable to anyone except those who have the key or the password to decrypt it. Data encryption is a common method of protecting data from unauthorized access, modification, or theft.

Question # 6
Which of the following is a difference between a primary key and a unique key?
A. A unique key cannot take null values, whereas a primary key can take null values.
B. There can be only one primary key in a data set, whereas there can be multiple unique keys.
C. A primary key can take a value more than once, whereas a unique key cannot take a value more than once.
D. A primary key cannot be a date variable, whereas a unique key can be.


B. There can be only one primary key in a data set, whereas there can be multiple unique keys.

Explanation:
The correct answer is B. There can be only one primary key in a data set, whereas there can be multiple unique keys.
A primary key is a column or a set of columns that uniquely identifies each row in a table. A table can have only one primary key, which also enforces the NOT NULL constraint on the column(s) involved. A primary key can also be referenced by a foreign key of another table to establish a relationship between the tables.
A unique key is a column or a set of columns that also uniquely identifies each row in a table, but it is not the primary key. A table can have more than one unique key, which also allows one NULL value for the column(s) involved. A unique key can also be referenced by a foreign key of another table to establish a relationship between the tables.
Some of the differences between a primary key and a unique key are:
A primary key creates a clustered index on the column(s), whereas a unique key creates a non-clustered index on the column(s).
A primary key does not allow any NULL values, whereas a unique key allows one NULL value for the column(s).
A primary key can be a unique key, but a unique key cannot be a primary key.

Question # 7
You are working with a dataset and need to swap the values in rows with those in columns. What action do you need to perform?
A. Recording
B. Filtering
C. Aggregation
D. Transposition


D. Transposition

Explanation:
Transpose creates a new data file in which the rows and columns in the original data file are transposed so that cases (rows) become variables and variables (columns) become cases. Transpose automatically creates new variable names and displays a list of the new variable names.
Transposing data is useful for data analysis. At times, we have to pull data from various files with different formats for analysis and preparing reports. In such circumstances, we may have to transpose some data from one file to the other. In excel, we can transpose data in multiple ways.

Question # 8
A data analyst is compiling a report that a Chief Executive Officer needs for an impromptu meeting. The report should include information on the previous day's performance. Which of the following reports should the analyst provide?
A. Tactical
B. Ad hoc
C. Dynamic
D. Recurring


B. Ad hoc


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CompTIA DA0-001 Exam Dumps

Exam Name: CompTIA Data+ Certification
Certification Name: CompTIA Data+

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