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.
A data analyst needs to perform a full outer join of a customer's orders using the tables below:
Which of the following is the mean of the order quantity?
A. 73.5
B. 76.5
C. 78.8
D. 81.5
Which of the following best describes a difference between JSON and XML?
A. JSON is quicker to read and write.
B. JSON has to use an end tag.
C. JSON strings are longer
D. JSON is much more difficult to parse.
A data analyst has a set with more than 40.000 rows in the sample schema below:
The analyst would like to create one column that contains the customers' birth dates. Which of the following data quality dimensions would BEST explain the reason for compilation?
A. Data accuracy
B. Data completeness
C. Data duplication
D. Data integrity
Which of the following roles is responsible for ensuring an organization's data quality, security, privacy, and regulatory compliance?
A. Data owner.
B. Data steward.
C. Data custodian.
D. Data processor.
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
Taylor wants to investigate how manufacturing, marketing, and sales expenditures impact overall profitability for her company.
Which of the following systems is the most appropriate?
A. OLTP.
B. OLAP.
C. Data warehouse.
D. Data mart.
Which of the following descriptive statistical methods are measures of central tendency? (Choose two.)
A. Mean
B. Minimum
C. Mode
D. Variance
E. Correlation
F. Maximum
What R package makes it easy to work with dates?
A. Lubridate.
B. Datemath.
C. Stringr.
D. ggplot.
Given the table below:
Which of the following boxes indicates that a Type Il error has occurred?
A. 1
B. 2
C. 3
D. 4
Which of the following is the correct data type for text?
A. Boolean
B. String
C. Integer
D. Float
A data analyst needs to present the results of an online marketing campaign to the marketing manager. The manager wants to see the most important KPIs and measure the return on marketing investment. Which of the following should the data analyst use to BEST communicate this information to the manager?
A. A real-time monitor that allows the manager to view performance the day the campaign was launched
B. A sell-service dashboard that allows the manager to look at the company's annual budget performance
C. A spreadsheet of the raw data from all marketing campaigns and channels
D. A summary with statistics, conclusions, and recommendations from the data analyst
Which of the following query optimization techniques involves examining only the data that is needed for a particular task?
A. Making a temporary table
B. Creating a flat file
C. Indexing documents
D. Creating an execution plan
Jenny wants to study the academic performance of undergraduate sophomores and wants to determine the average grade point average at different points during an academic year.
What best describes the data set she needs?
A. Sample.
B. Observation.
C. Variable.
D. Population.
A data analyst is developing a data dictionary that aligns with a company's data management processes and policies. Which of the following best describes what should be included in the data dictionary?
A. Information containing the links to business data
B. Information explaining the business methodologies
C. Information containing definitions of the business data
D. Information describing the data analysis phases