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NEW QUESTION 121
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.   SELECT
B.   ALTER
C.   INSERT
D.   UPDATE
Answer: C
Explanation:
– 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 122
Which one of the following in NOT a common data integration tool?
A.   XSS
B.   ELT
C.   ETL
D.   APIs
Answer: A
Explanation:
Cross-site Scripting (XSS) is a security vulnerability usually found in websites and/or web applications that accept user input. XSS is a client-side vulnerability that targets other application users, while SQL injection is a server- side vulnerability that targets the application’s database. How do I prevent XSS in PHP? Filter your inputs with a whitelist of allowed characters and use type hints or type casting.
NEW QUESTION 123
You are working with a professional statistician to perform an analysis and would like to use a statistics package. Which one of the following would be the most appropriate?
A.   Rapid Miner.
B.   QLIK.
C.   Power BI.
D.   Minitab.
Answer: D
Explanation:
Minitab is statistical analysis software. It can be used for learning about statistics as well as statistical research. Statistical analysis computer applications have the advantage of being accurate, reliable, and generally faster than computing statistics and drawing graphs by hand.
NEW QUESTION 124
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
Answer: D
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 must 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.
NEW QUESTION 125
Emma is working in a data warehouse and finds a finance fact table links to an organization dimension, which in turn links to a currency dimension that not linked to the fact table. What type of design pattern is the data warehouse using?
A.   Star.
B.   Sun.
C.   Snowflake.
D.   Comet.
Answer: C
Explanation:
Since the dimension links to a dimension that isn’t connected to the fact table, it must be a Snowflake, with a Star, all dimensions link directly to the fact table, Sun and Comet are not data warehouse design patterns.
NEW QUESTION 126
What subset of Structured Query Language (SQL) is used to add, remove, modify, or retrieve the information stored within a relational database?
A.   DDL
B.   DSL
C.   DQL
D.   DML
Answer: D
Explanation:
The Data Manipulation Language (DML) is used to work with the data stored in a database. DML includes the SELECT, INSERT, UPDATE, and DELETE commands. The Data Definition Language (DDL) contains the commands used to create and structure a relational database. It includes the CREATE, ALTER, and DROP commands. DDL and DML are the only two sublanguages of SQL.
NEW QUESTION 127
Andrew conducts a study and wants to capture eye color. What kind of data is eye color?
A.   Discrete.
B.   Categorical.
C.   Continuous.
D.   Alphanumeric.
Answer: B
Explanation:
Eye color can only fall into a certain range of values; as such, it is categorical.
NEW QUESTION 128
Oliver is designing an ETL process to copy sales data into a data warehouse on a hourly basis. What approach should Oliver choose that would be most efficient and minimize the chance of losing historical data?
A.   Bulk load.
B.   Purge and load.
C.   Use ELT instead of ETL.
D.   Delta load.
Answer: D
Explanation:
Since Oliver needs to migrate changes every hour, a delta load is the best approach.
NEW QUESTION 129
According to the empirical rule, what percent of thee values in a sample fall within three standard deviations of the mean in a normal distribution?
A.   99.70%
B.   95%
C.   90%
D.   68%
Answer: A
Explanation:
According to the empirical rule, 68% of values are within one standard deviation, 95% are within two standard deviations, and 99.7% are within three standard deviations.
NEW QUESTION 130
What is NOT a characteristic of a good data steward?
A.   A good technology expert.
B.   Collaborative.
C.   A subject matter expert.
D.   Influential.
Answer: A
Explanation:
Provide the technical expertise around source systems, extract, transform, and load (ETL) processes, data stores, data warehouses, and business intelligence tools.
NEW QUESTION 131
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.   Subsetting the records.
B.   Parameterizing the query.
C.   Recompiling the query.
D.   Adding an index.
Answer: D
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 132
How many variables may be shown in a simple pie chart?
A.   4
B.   3
C.   2
D.   1
Answer: D
NEW QUESTION 133
What type of report is commonly used to make operational decisions?
A.   Strategic
B.   Research
C.   Compliance
D.   Tactical
Answer: D
NEW QUESTION 134
In a tabular dataset, what term is used to describe the data that appears in a single row?
A.   Attribute.
B.   Records.
C.   Field.
D.   Table.
Answer: B
NEW QUESTION 135
What effort has the goal of maintaining a single source of truth for the most important data elements handled by the organization?
A.   MDM (Master Data Management)
B.   IPS (Intrusion Prevention System)
C.   MAM (Mobile Application Management)
D.   DLP (Data Loss Prevention)
Answer: A
Explanation:
Master data management (MDM) involves creating a single master record for each person, place, or thing in a business, from across internal and external data sources and applications. This information has been de-duplicated, reconciled and enriched, becoming a consistent, reliable source. Once created, this master data serves as a trusted view of business-critical data that can be managed and shared across the business to promote accurate reporting, reduce data errors, remove redundancy, and help workers make better-informed business decisions.
NEW QUESTION 136
What is an example of data in transit?
A.   Data in memory on a computer.
B.   Data on a smartphone.
C.   Data on a hard disk.
D.   Data on a network.
Answer: D
Explanation:
A data network is a system designed to transfer data from one network access point to one other or more network access points via data switching, transmission lines, and system controls. Data networks consist of communication systems such as circuit switches, leased lines, and packet switching networks.
NEW QUESTION 137
What term is used to describe an interactive visualization that encourages people to explore data dynamically?
A.   Data set.
B.   Dashboard.
C.   Data point.
D.   Graphical representation.
Answer: B
Explanation:
A dashboard is a visual display of all your data. While it can be used in all kinds of different ways, its primary intention is to provide information at-a-glance, such as KPIs. A dashboard usually sits on its own page and receives information from a linked database.
NEW QUESTION 138
What term indicates whether an attribute’s value is within an expected range?
A.   Data integrity.
B.   Data validity.
C.   Data processing.
D.   Data availability.
Answer: B
Explanation:
Data validation means checking the accuracy and quality of source data before using, importing, or otherwise processing data. Different types of validation can be performed depending on destination constraints or objectives. Data validation is a form of data cleansing.
NEW QUESTION 139
You would like to measure how well an organization is achieving its goals. What type of analysis should you perform?
A.   Performance analysis.
B.   Outlier analysis.
C.   Predictive analysis.
D.   Trend analysis.
Answer: A
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 140
What R package makes it easy to work with dates?
A.   Lubridate
B.   Datemath
C.   Stringr
D.   ggplot
Answer: A
Explanation:
Lubridate is an R package that makes it easier to work with dates and times.
NEW QUESTION 141
Which of the following are reasons to create and maintain a data dictionary? (Choose two.)
A.   To improve data acquisition.
B.   To remember specifics about data fields.
C.   To specify user groups for databases.
D.   To provide continuity through personnel turnover.
E.   To confine breaches of PHI data.
F.   To reduce processing power requirements.
Answer: AB
NEW QUESTION 142
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?
A.   Distribute the report to the appropriate stakeholders via email.
B.   Use a watermark to identify the report as a draft.
C.   Show the report to her immediate supervisor.
D.   Publish the report on an internally facing website.
Answer: B
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 143
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