Data Science
SQL Interview Questions and Answers
Basic SQL Queries: Write a query to retrieve all customers from a Customers table who are located in the city…
Data Science
What is Fleet Provisioning API?
Fleet Provisioning API is part of AWS IoT Core that simplifies the process of provisioning large numbers of IoT devices. Fleet…
Data Science
AWS’s Solutions Across IaaS, PaaS, and SaaS Models
Amazon Web Services (AWS) operates across the three main cloud service models: Infrastructure as a Service (IaaS), Platform as a…
Data Science
Process Time Ratio
The Process Time Ratio (PTR) serves as a key metric for evaluating the efficiency of various processes within service calls.…
Data Science
What is Amazon Monitron?
Amazon Monitron is an end-to-end system designed by Amazon Web Services (AWS) to enable customers to monitor and detect anomalies…
Data Science
What are SDKs used for?
SDKs, or Software Development Kits, are collections of software tools and libraries that developers use to create applications for specific…
Data Science
How to Deploy AWS IoT: From Device Setup to Data Recovery
Setup your IoT device: Ensure your IoT device can send data over the Internet, typically via MQTT or HTTPS. Secure…
Data Science
What is NetSuite?
NetSuite is a cloud-based Enterprise Resource Planning (ERP) software suite that offers a broad set of applications, including accounting, Customer…
Data Science
What is Snowflake Schema?
The Snowflake Schema is a normalized form of a Star Schema in a Data Warehouse. Both Star and Snowflake Schemas…
Data Science
What is Star Schema?
The star schema is a type of database schema commonly used in data warehousing systems and multidimensional databases for OLAP…
Data Science
What is OLAP?
OLAP stands for “Online Analytical Processing.” It’s a category of software tools that allows users to interactively analyze multidimensional data…
Data Science
What is Conjoint Analysis?
Conjoint analysis is a statistical technique used in market research to determine how people value different attributes or features that…
Data Science
What is Mann-Whitney U Test?
The Wilcoxon-Mann-Whitney test, often just referred to as the Mann-Whitney U test, is a nonparametric test of the null hypothesis…
Data Science
What is Wilcoxon Test?
The Wilcoxon test, also known as the Wilcoxon rank-sum test or the Mann-Whitney U test, is a non-parametric statistical test…
Data Science
What is Central Limit Theorem?
The Central Limit Theorem (CLT) is a key theory in statistics and probability. It states that if you have a…
Data Science
What is Bootstrapping?
Bootstrapping is a powerful statistical method that involves generating “bootstrap” samples from an existing dataset and then analyzing these samples.…
Communication
What is Bessel’s Correction?
Bessel’s correction is a statistical adjustment made to the calculation of the sample variance (and by extension, sample standard deviation).…
Data Science
What is Gaussian Distribution?
The Gaussian distribution, also known as the normal distribution or bell curve, is a type of continuous probability distribution for…
Data Science
What is Cluster Sampling?
Cluster sampling is a sampling method used when studying large populations spread across a wide area. It’s particularly useful when…
Data Science
What is Multistage Sampling?
Multistage sampling is a complex form of probability sampling that involves several stages of sampling. This method is used when…
Data Science
What is Stratified Sampling?
Stratified sampling is a statistical method used when the population is heterogeneous, or diverse, but can be partitioned into different…
Data Science
What is Weighted Sampling?
Weighted sampling is a statistical technique used to correct any imbalances or biases in a dataset by assigning different weights…
Data Science
Accuracy, Sensitivity, and Specificity
These terms are commonly used in statistics, particularly in the fields of epidemiology and machine learning, to evaluate the performance…
Data Science
What is PowerShell?
PowerShell is a task-based command-line shell and scripting language built on .NET. Initially, it was developed by Microsoft for the…
Data Science
What is PaaS?
Platform as a Service (PaaS) is a cloud computing model that delivers a platform to users, allowing them to develop,…
Data Science
What is IaaS?
Infrastructure as a Service (IaaS) is a type of cloud computing service that provides virtualized computing resources over the internet.…
Data Science
What are Fitted values?
Fitted values are the predicted values of a response variable in a statistical model. They are computed from the predictor…
Data Science
What is Shared Responsibility Model?
The shared responsibility model is a framework often used in cloud computing to define the roles and responsibilities of the…
Data Science
What is Scrum?
Scrum is a framework for project management that emphasizes teamwork, communication, and speed. It is most commonly used in agile…
Data Science
What is Logistic Regression?
Logistic Regression is a statistical method used for analyzing and modeling the relationship between a binary (dichotomous) dependent variable and…
Data Science
What is OLS?
Ordinary Least Squares (OLS) is a linear regression method used to estimate the relationship between one or more independent variables…
Data Science
What is np.linspace?
`np.linspace` is a function in the NumPy library, which is a popular library in Python for scientific computing and working…
Data Science
What is strptime ?
strptime is a method available in Python’s datetime module. It stands for “string parse time”. It is used to convert…
Data Science
What is Context Manager?
A context manager in Python is a programming construct that allows you to manage resources, such as file handles or…
Data Science
Mutable vs Immutable
In Python, objects can be classified as mutable or immutable based on whether their state can be changed after they…
Data Science
The Dangers of Repeated Code
Repeated code, also known as code duplication or copy-pasting, refers to instances where the same or very similar code is…
Data Science
What is Two-Sample t-Test?
The two-sample t-test, also known as the independent samples t-test, is a statistical hypothesis test used to compare the means…
Data Science
What is Two-Sample Proportion Test?
The two-sample proportion test is a statistical hypothesis test used to compare the proportions of a specific attribute (e.g., success,…
Data Science
What is A/B Testing?
A/B testing, also known as split testing or bucket testing, is a statistical methodology used to compare the performance of…
Data Science
What is strftime?
strftime is a method available in Python’s datetime module. It stands for “string format time”. It is used to convert…
Data Science
What is Blocking?
Blocking is a technique used in data analysis, particularly in record linkage and deduplication, to reduce the number of comparisons…
Data Science
What is EB-2?
The EB-2 (Employment-Based, Second Preference) is a U.S. immigrant visa category designed for foreign nationals who possess an advanced degree…
Data Science
What is FuzzyWuzzy?
FuzzyWuzzy is a popular Python library used for string matching and comparison. It employs a technique called “fuzzy string matching”…
Psychology
What is 10,000-hour rule?
The 10,000-hour rule is a popular concept in the field of skill acquisition and expertise development, which suggests that it…
Data Science
What is Word Embedding?
Word embedding is a technique used in natural language processing (NLP) to represent words as numerical vectors in a high-dimensional…
Data Science
What is Syntactic Analysis?
Syntactic analysis, also known as parsing or syntax analysis, is the process of analyzing the structure of a sentence by…
Data Science
What is Semantic Analysis?
Semantic analysis is the process of understanding and interpreting the meaning of words, phrases, sentences, and text within a given…
Data Science
What is MNAR?
MNAR stands for “Missing Not at Random,” which is another type of missing data mechanism in which the missingness of…
Data Science
What is MAR?
MAR stands for “Missing at Random,” which is another type of missing data mechanism in which the missingness of data…
Data Science
What is MCAR?
MCAR stands for “Missing Completely at Random,” which refers to a type of missing data mechanism in which the missingness…
Data Science
How to Read and Write MATLAB Files in Python?
To read and write MATLAB files in Python, you can use the SciPy library. Here are the steps you can…
Data Science
What is HDF (Hierarchical Data Format)?
HDF (Hierarchical Data Format) is a data file format used to store and manage large amounts of complex data. It…
Data Science
How to Read stata files in Python?
To read Stata files in Python, you can use the pandas library. Here are the steps you can follow: Install…
Communication
What is The ADEPT technique?
The ADEPT technique is an effective method for learning and explaining complex concepts by breaking them down into simpler, more…
Data Science
What is Tokenization?
Tokenization is a natural language processing technique that involves breaking down a text or a document into individual words, phrases,…
Data Science
What is Faceting?
Faceting is a powerful technique that allows us to display subsets of data on different panels of a plot or…
Data Science
Univariate vs Bivariate
In statistics and data analysis, univariate refers to a dataset or analysis that involves a single variable or feature. Univariate…
Data Science
What is displot?
In Seaborn, displot is a function that allows you to create a figure that combines several different types of plots…
Data Science
What is KDE?
In Seaborn, KDE stands for Kernel Density Estimation. KDE is a non-parametric method for estimating the probability density function of…
Persian Culture
What is Gheime Bademjoon?
Gheime Bademjoon is a traditional Persian dish made with fried eggplant, yellow split peas, tomato paste, and beef or lamb.…
Data Science
Useful Certifications for Data Scientists
There are several certifications that can be useful for data scientists to have, depending on their area of focus and…
Process Improvement
What is the Moving Median Range (MMR)
The Moving Median Range (MMR) is a variation of the more common Moving Range (MR) chart. The MR chart is…
Psychology
What is Dunning-Kruger Effect
The Dunning-Kruger effect is a cognitive bias in which individuals with low ability or knowledge in a particular domain tend…
Data Science
What is Virtualenv
Virtualenv is a tool that creates an isolated Python environment. It allows you to create a separate environment with its…
Data Science
What are the types of positioning systems?
There are several types of positioning systems, including: Global Navigation Satellite Systems (GNSS): These include popular systems like GPS (Global…
Data Science
Longitudinal Studies vs Cross-sectional Studies
Longitudinal studies and cross-sectional studies are two types of research designs used in scientific studies to investigate changes over time…
Data Science
Observational Studies vs Controlled Experiments
Observational studies and controlled experiments are two types of research designs used in scientific studies to investigate the relationship between…
Data Science
What is Spearman’s Rho Correlation?
Spearman’s rank correlation, also known as Spearman’s rho correlation, is a non-parametric measure of the strength and direction of the…
Data Science
What is Kendall’s Tau Correlation
Kendall’s tau correlation is a non-parametric measure of the strength and direction of the association between two variables. It measures…
Data Science
What is Pearson Correlation?
Pearson correlation (also known as Pearson’s correlation coefficient) is a statistical measure that describes the linear relationship between two variables.…
Data Science
What is the Poisson Distribution?
The Poisson distribution is a probability distribution that describes the probability of a given number of events occurring in a…
Data Science
What is Inferential Statistics?
Inferential statistics is a branch of statistics that involves using a sample of data to make generalizations or predictions about…
Data Science
What is Descriptive Statistics?
Descriptive statistics is a branch of statistics that involves the collection, analysis, and presentation of data in a way that…
Data Science
What are the types of positioning systems?
There are several types of positioning systems, including: Global Navigation Satellite Systems (GNSS): These include popular systems like GPS (Global…
Data Science
What are different types of joins?
here’s a brief list of the different types of joins in ANSI-standard SQL: Inner Join: Returns only the matching rows…
Data Science
What are fact and dimension tables?
Fact and dimension tables are key components of a dimensional data model used in data warehousing. They help organize and…
Data Science
What is a data cube, AKA “OLAP”?
A data cube, also known as an OLAP (Online Analytical Processing) cube, is a multi-dimensional data structure that allows for…
Data Science
How to remove duplicate rows in python?
drop_duplicates is a method in Pandas, a Python library used for data manipulation and analysis, that allows you to remove…
Data Science
What are UNION and UNION ALL?
In database management systems, UNION and UNION ALL are used to combine the results of two or more SELECT statements…
Data Science
What Does Database Management Refer to?
Database management refers to the process of organizing, storing, retrieving, and securing data in a database. A database is a…
Data Science
What is Data Science?
Data science is a multidisciplinary field that involves the extraction, management, analysis, and interpretation of large and complex datasets using…
Data Science
What is Machine Learning?
Machine learning is a subfield of artificial intelligence (AI) that involves training computer algorithms to automatically learn patterns and insights…
Data Science
What is the first thing to do when working with a new data frame?
When a new DataFrame is received for work, the first thing that needs to be done is to examine and…
Data Science
What is NumPy?
NumPy (short for Numerical Python) is a Python library for scientific computing that provides support for large, multi-dimensional arrays and…
Data Science
SOAP vs REST
SOAP (Simple Object Access Protocol) and REST (Representational State Transfer) are two popular architectural styles for building web services. Here…
Data Science
What is JSON?
JSON stands for “JavaScript Object Notation”. It is a lightweight data interchange format that is easy for humans to read…
Data Science
What is XML?
XML stands for “Extensible Markup Language”. It is a markup language used for encoding documents in a format that is…
Data Science
What is Base64 encoded?
Base64 encoding is a method of encoding binary data in ASCII format, which can be easily transmitted over networks or…
Data Science
What is a Singleton Resource?
In RESTful API design, a singleton resource is a resource that represents a single, unique entity or object. Unlike collections,…
Data Science
What are HTTP status messages?
HTTP status messages, also known as HTTP status codes, are a set of standardized responses that web servers provide to…
Data Science
What is a URN?
URN (Uniform Resource Name) is another type of URI (Uniform Resource Identifier), used to provide a persistent and location-independent identifier…
Data Science
What is Hypertext Transfer Protocol?
HTTP (Hypertext Transfer Protocol) is a protocol used to transfer data over the World Wide Web. It is the foundation…
Data Science
What is a RESTful API?
A RESTful API (Representational State Transfer) is a type of web API that follows a set of principles and constraints…
Data Science
What is a URL?
A URL (Uniform Resource Locator) is a type of URI (Uniform Resource Identifier) that specifies the location of a resource…
Data Science
What is a URI?
A URI (Uniform Resource Identifier) is a string of characters that identifies a name or a resource on the internet.…
Data Science
What are the steps for collecting data ERP system?
The specific steps of collecting data from an ERP system can vary depending on the ERP system being used and…
Data Science
How to obtain an access token by posting the client ID and client secret to an API?
The specific process for obtaining an access token by posting the client ID and client secret to an API will…
Data Science
How to acquire an access token?
The process of acquiring an access token depends on the specific API or service you are trying to access. Generally…
Data Science
What is a REST API?
REST stands for Representational State Transfer, and a REST API is a type of web API that uses HTTP requests…
Data Science
How to collect data from an ERP system?
The specific steps of collecting data from an ERP system can vary depending on the ERP system being used and…
Data Science
What is a “middle tier”?
In computer architecture and software design, the “middle tier” is a layer of software that sits between the user interface…