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Right Answer:
The common status codes in HTTP responses are:

- **200**: OK
- **201**: Created
- **204**: No Content
- **400**: Bad Request
- **401**: Unauthorized
- **403**: Forbidden
- **404**: Not Found
- **500**: Internal Server Error
- **502**: Bad Gateway
- **503**: Service Unavailable

Right Answer:
Synchronous API calls wait for the response before moving on to the next task, while asynchronous API calls allow the program to continue executing other tasks while waiting for the response.

Right Answer:
An API (Application Programming Interface) is a set of rules and protocols that allows different software applications to communicate with each other. It defines the methods and data formats that applications can use to request and exchange information. APIs work by sending requests from one application to another, which then processes the request and sends back a response.

Right Answer:
API testing is the process of verifying that an application programming interface (API) functions as expected, ensuring it meets the requirements for functionality, reliability, performance, and security. Tools that can be used for API testing include Postman, SoapUI, JMeter, RestAssured, and Swagger.

Right Answer:
API versioning is the practice of managing changes to an API by assigning version numbers to different iterations of the API. It is important because it allows developers to introduce new features or make changes without breaking existing client applications that rely on older versions, ensuring backward compatibility and a smoother transition for users.

Right Answer:
Outliers are data points that significantly differ from the rest of the dataset. They can skew results and affect statistical analyses. To handle outliers, you can:

1. Identify them using methods like the IQR (Interquartile Range) or Z-scores.
2. Remove them if they are errors or irrelevant.
3. Transform them using techniques like log transformation.
4. Use robust statistical methods that are less affected by outliers.
5. Analyze them separately if they provide valuable insights.

Right Answer:
Exploratory Data Analysis (EDA) is the process of analyzing and summarizing datasets to understand their main characteristics, often using visual methods. It helps identify patterns, trends, and anomalies in the data before applying formal modeling techniques.

Right Answer:
1. Remove duplicates
2. Handle missing values
3. Correct inconsistencies
4. Standardize formats
5. Filter out irrelevant data
6. Validate data accuracy
7. Normalize data if necessary

Right Answer:
To handle missing data in a dataset, you can use the following methods:

1. **Remove Rows/Columns**: Delete rows or columns with missing values if they are not significant.
2. **Imputation**: Fill in missing values using techniques like mean, median, mode, or more advanced methods like KNN or regression.
3. **Flagging**: Create a new column to indicate missing values for analysis.
4. **Predictive Modeling**: Use algorithms to predict and fill in missing values based on other data.
5. **Leave as Is**: In some cases, you may choose to leave missing values if they are meaningful for analysis.

Right Answer:
SQL (Structured Query Language) is used in data analysis to query, manipulate, and manage data stored in relational databases. It allows analysts to retrieve specific data, perform calculations, filter results, and aggregate information to derive insights from large datasets.

Right Answer:
Correlated subqueries can lead to performance issues because they are executed repeatedly for each row processed by the outer query. This can result in increased execution time and resource consumption. Additionally, they can complicate query optimization and may lead to difficulties in understanding and maintaining the code.

Right Answer:
You can run a graph continuously without using continuous components by scheduling the graph to run at regular intervals using a job scheduler or by implementing a loop in a script that triggers the graph execution repeatedly.

Right Answer:
A single vendor platform is an e-commerce site where one seller offers products, while a multivendor platform allows multiple sellers to sell their products on a single site.

Right Answer:
Some common challenges in running an e-commerce business include:

1. Competition: Standing out in a crowded market.
2. Customer Trust: Building credibility and trust with customers.
3. Logistics: Managing inventory, shipping, and returns efficiently.
4. Payment Security: Ensuring secure payment processing.
5. Technology: Keeping up with evolving technology and platforms.
6. Marketing: Effectively reaching and engaging target audiences.
7. Customer Service: Providing timely and effective support.
8. Legal Compliance: Navigating regulations and tax requirements.

Right Answer:

It seems that the question is missing. Please provide the specific question related to cross-selling so I can give you the correct answer.

Right Answer:
Digital marketing plays a crucial role in e-commerce by driving traffic to online stores, increasing brand visibility, engaging customers through targeted advertising, and facilitating conversions through strategies like SEO, social media marketing, email campaigns, and content marketing.

Right Answer:

Active listening helps in cross-selling by allowing the salesperson to understand the customer's needs and preferences better, enabling them to suggest relevant products or services that complement what the customer is already interested in.