1.
In a dataset, what does the term "skewness" indicate?
The average value of the dataset
The symmetry or asymmetry of the data distribution
The total number of data points
The relationship between two variables
2.
What is the primary purpose of data cleaning in data analysis?
To enhance data visualization
To remove inaccuracies and inconsistencies in data
To increase data storage capacity
To automate data entry processes
3.
What is a key advantage of using a box plot in data analysis?
It shows trends over time
It displays the correlation between two variables
It summarizes the distribution, central tendency, and variability of a dataset
It breaks down categorical data
4.
In the ETL process, what does the "L" stand for?
Log
Load
Link
List
5.
In SQL, which command is used to retrieve specific data from a database?
INSERT
DELETE
SELECT
UPDATE
6.
What is the purpose of a left join in SQL?
To retrieve all records from the left table and matching records from the right table
To retrieve only matching records from both tables
To retrieve only records from the right table
To combine records from both tables without matching
7.
What type of analysis helps in identifying patterns, trends, or correlations in data using historical data?
Prescriptive analysis
Predictive analysis
Descriptive analysis
Diagnostic analysis
8.
What is the main benefit of using a correlation matrix?
It shows relationships between all variables in a dataset
It displays the distribution of data
It helps in data cleaning
It organizes data into categories
9.
What is the purpose of a data pipeline?
To store the actual data values in a database
To automate the process of moving and transforming data from different sources to a destination
To develop marketing strategies based on customer data
To visualize data using charts and graphs
10.
What is the difference between a population and a sample?
A population is the entire group of individuals or objects that you are interested in studying, while a sample is a subset of the population
A sample is the entire group of individuals or objects that you are interested in studying, while a population is a subset of the sample
Populations and samples are the same thing
Populations are used for quantitative data, while samples are used for qualitative data
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