10+ Cognizant Data Analyst Interview Questions and Answers

Questions related to data analysis techniques and methods.

• Bais and variance trade-off: balancing model complexity and accuracy

• Handling imbalanced data: resampling techniques, adjusting class weights, using different evaluation metrics

• Multicollinearity: when predictor variables are highly correlated, can be handled by feature selection or regularization

• Lasso & Ridge: regularization techniques to prevent overfitting by adding penalty terms to the loss function

• Bagging vs Boostin...read more

I would query the relevant stakeholders involved in the data collection process.

• Identify the stakeholders involved in the data collection process

• Reach out to them to understand the data collection process and identify any potential issues

• Collaborate with them to resolve the TP discrepant data

I don't have the available data to answer the question.

The importance of data-driven decision making

• Data-driven decision making is crucial for businesses to stay competitive

• It involves collecting and analyzing data to make informed decisions

• Examples include using customer data to improve marketing strategies or analyzing financial data to make investment decisions

• Data-driven decision making can lead to increased efficiency, cost savings, and better outcomes

• However, it's important to ensure the data being used is accurate and rele...read more

SQL commands are used to manipulate and retrieve data from relational databases.

• SQL stands for Structured Query Language

• Common SQL commands include SELECT, INSERT, UPDATE, and DELETE

• SQL commands are used to create, modify, and delete database objects such as tables, views, and indexes

• Examples: SELECT * FROM customers; INSERT INTO orders (customer_id, order_date) VALUES (1, '2021-01-01'); UPDATE products SET price = 10.99 WHERE id = 1; DELETE FROM customers WHERE id = 1;

There are six types of joints in the human body, each with its unique structure and function.

• Fibrous joints - immovable joints found in the skull

• Cartilaginous joints - slightly movable joints found in the spine

• Synovial joints - freely movable joints found in the limbs

• Ball and socket joint - allows for a wide range of motion, found in the hip and shoulder

• Hinge joint - allows for movement in one direction, found in the knee and elbow

• Pivot joint - allows for rotational movement,...read more

PV - Pharmacovigilance, PV - Present Value, PV - Photovoltaic

• Pharmacovigilance (PV) - monitoring and assessing the safety of drugs

• Present Value (PV) - current worth of a future sum of money

• Photovoltaic (PV) - technology that converts sunlight into electricity

Regulatory agencies oversee and enforce laws and regulations in different countries.

• FDA (Food and Drug Administration) - United States

• EMA (European Medicines Agency) - European Union

• MHRA (Medicines and Healthcare products Regulatory Agency) - United Kingdom

• TGA (Therapeutic Goods Administration) - Australia

Different classes of drugs include opioids, stimulants, depressants, hallucinogens, and cannabinoids.

• Opioids: Examples include morphine, codeine, and oxycodone.

• Stimulants: Examples include cocaine, amphetamines, and methylphenidate.

• Depressants: Examples include alcohol, benzodiazepines, and barbiturates.

• Hallucinogens: Examples include LSD, psilocybin, and MDMA.

• Cannabinoids: Examples include THC and CBD.

Transposing a data set involves flipping rows and columns.

• Identify the data set to be transposed

• Create a new table with the columns and rows flipped

• Copy the data from the original table to the new table

• Transpose can be done using Excel, Python, R, SQL, etc.

• Example: Transposing a table of sales data to have products as rows and months as columns

ADR stands for Adverse Drug Reaction, while AE stands for Adverse Event. ADR specifically refers to reactions caused by drugs.

• ADR is a reaction caused by a drug, while AE is a broader term that includes any unexpected or harmful reaction.

• ADR is specifically related to drugs, while AE can include reactions to other factors such as medical devices or procedures.

• Example: A patient experiencing nausea after taking a prescribed medication would be considered an ADR, while a patien...read more

C is a procedural language while Java is an object-oriented language.

• C is compiled while Java is interpreted

• C has pointers while Java does not

• Java has automatic garbage collection while C does not

• Java is platform-independent while C is not

• Java has built-in support for multithreading while C does not

CDM stands for Common Data Model, used to standardize data for analysis. Experience in database management is crucial for data analysts.

• CDM is a standardized, structured data model used to organize and analyze data from various sources.

• Experience in database management is essential for working with CDM, as it involves storing, retrieving, and manipulating data.

• Knowledge of SQL and database querying is important for extracting and analyzing data within the CDM framework.

• Famili...read more

C++ is a high-level programming language used for developing system software, application software, and video games.

• C++ is an extension of the C programming language.

• It supports object-oriented programming concepts like classes, inheritance, and polymorphism.

• C++ is used for developing operating systems, device drivers, and embedded systems.

• It is also popular for developing video games and high-performance applications.

• Examples of software written in C++ include the Windows op...read more

The process outline involves identifying the problem, collecting and analyzing data, and presenting insights and recommendations.

• Identify the problem or question to be answered

• Collect relevant data from various sources

• Clean and preprocess the data

• Analyze the data using statistical methods and tools

• Visualize the data to identify patterns and trends

• Present insights and recommendations to stakeholders