Marsh McLennan Global Services Data Analyst Intern Interview Questions and Answers

Q1. Explain about Projects
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Q1. Questions based on projects in the resume
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Q2. Machine learning questions
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There was an aptitude test with 30 questions to complete within 45 min.

3 Coding questions to complete within 1hr.

Q1. HR round was simple and was about how my skills can fit into the organisation.
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Q2. What are my skills and how you will use them (gave me a scenario)?
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Assignment on credit risk

Q1. Hyperparameter tuning
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Q1. Case study for problem solving
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Q1. Tell me about your self
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Q1. How much experience do you have?
Ans. 
I have 8 years of experience in data science, with a focus on machine learning and predictive modeling.
• 8 years of experience in data science

• Specialize in machine learning and predictive modeling

• Worked on various projects involving big data analysis

• Experience with programming languages such as Python and R
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Q2. What is the tech stake you ahve worked on?
Ans. 
I have worked on developing machine learning models for predictive maintenance in the manufacturing industry.
• Developed machine learning algorithms to predict equipment failures in advance

• Utilized sensor data and historical maintenance records to train models

• Implemented predictive maintenance solutions to reduce downtime and maintenance costs
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Q1. What is Gradient Descents?
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Gradient descent is an optimization algorithm used to minimize a function by iteratively moving in the direction of steepest descent.
• Gradient descent is used to find the minimum of a function by taking steps proportional to the negative of the gradient at the current point.

• It is commonly used in machine learning to optimize the parameters of a model by minimizing the loss function.

• There are different variants of gradie...read more
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Q2. What is LSTM?, and what are the gates in it?
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LSTM (Long Short-Term Memory) is a type of recurrent neural network designed to handle long-term dependencies.
• LSTM has three gates: input gate, forget gate, and output gate.

• Input gate controls the flow of information into the cell state.

• Forget gate decides what information to discard from the cell state.

• Output gate determines the output based on the cell state.
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Q3. They gave me a link to dataset and started saying the operations to apply on that. E.g, value_counts, null_values, fill the values with mean,etc.
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Q4. What is t-test? What is Mean, Median and Mode and where to use these?
Ans. 
T-test is a statistical test used to determine if there is a significant difference between the means of two groups.
• Mean is the average of a set of numbers, median is the middle value when the numbers are ordered, and mode is the most frequently occurring value.

• Mean is sensitive to outliers, median is robust to outliers, and mode is useful for categorical data.

• T-test is used to compare means of two groups, mean is used...read more
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Q5. What is RANDOM FOREST ?
Ans. 
Random Forest is an ensemble learning method used for classification and regression tasks.
• Random Forest is a collection of decision trees that are trained on random subsets of the data.

• Each tree in the forest makes a prediction, and the final prediction is the average (regression) or majority vote (classification) of all trees.

• Random Forest helps reduce overfitting and improve accuracy compared to a single decision tre...read more
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Q1. What is Bert and transformer
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Bert and transformer are models used in natural language processing for tasks like text classification and language generation.
• Bert (Bidirectional Encoder Representations from Transformers) is a transformer-based model developed by Google for NLP tasks.

• Transformer is a deep learning model architecture that uses self-attention mechanisms to process sequential data like text.

• Both Bert and transformer have been widely use...read more
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Q2. NLP pre processing techniques
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NLP pre processing techniques involve cleaning and preparing text data for analysis.
• Tokenization: breaking text into words or sentences

• Stopword removal: removing common words that do not add meaning

• Lemmatization: reducing words to their base form

• Normalization: converting text to lowercase

• Removing special characters and punctuation
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Q1. Basic questions
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Q2. Strength weakness
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