Stellar Innovations Senior Analyst Interview Questions and Answers

Q1. Move all 0's to the end of the list
Ans. 
Move all 0's to the end of the list in an array of strings
• Iterate through the array and move all 0's to the end while maintaining the order of other elements

• Use two pointers approach to swap 0's with non-zero elements
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Q1. 7 MCQ questions related to Data Science
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Q2. 2 Coding questions related to Python
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They will give 2-3 Python coding questions related to List, Dictionary, String.

1. Coding Test Conducted on Hackereath.
There were 10 MCQ each carrying 10 marks.
2 programming questions (40pts, 60pts)
Question were based on DP and Segment Tree.

Q1. Q1. Implement python Collection Counter from Scratch.
Ans. 
Implementing Python Collection Counter from Scratch
• Create an empty dictionary to store the elements and their count

• Iterate through the input list and add elements to the dictionary with their count

• Return the dictionary

• Example: input_list = ['apple', 'banana', 'apple', 'orange', 'banana']

• Output: {'apple': 2, 'banana': 2, 'orange': 1}
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Q2. Q2. Do Matrix Multiplication. Q3. Implement Factorial and Fibonacci Series with different Approaches.
Ans. 
Matrix multiplication, factorial and Fibonacci series implementation
• Matrix multiplication involves multiplying two matrices to get a third matrix

• Factorial is the product of all positive integers up to a given number

• Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones

• Factorial can be implemented using recursion or iteration

• Fibonacci series can be implemented using recursion or
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Q3. Q4. What is the probability of getting 5 Sundays in 31 day month.
Ans. 
The probability of getting 5 Sundays in a 31 day month is less than 1%.
• There are 7 days in a week, so the probability of any given day being a Sunday is 1/7.

• In a 31 day month, there are 4 full weeks and 3 extra days.

• The probability of the first 4 weeks having 4 Sundays is (1/7)^4.

• The probability of the remaining 3 days being Sundays is (3/7).

• Multiplying these probabilities gives a total probability of less than 1%.
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Q4. Q5. There were 100 coins. 99 Unbiased Coins, 1. Coin is biased. Derive the probability of getting 10 heads given the even of unbiased coins using Bayes Theorem.
Ans. 
Using Bayes Theorem, find the probability of getting 10 heads given 99 unbiased coins and 1 biased coin.
• Identify the prior probability of getting 10 heads with unbiased coins

• Calculate the likelihood of getting 10 heads with the biased coin

• Use Bayes Theorem to calculate the posterior probability of getting 10 heads given the mix of coins

• Consider the impact of the biased coin on the overall probability
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Q1. Q1. Implement a Program to check if a number is power of 3 .
Ans. 
Program to check if a number is power of 3
• Use logarithm to check if the result is an integer

• Check if the number is greater than 0

• Check if the remainder is 0 when the number is divided by 3 repeatedly
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Q2. Q2. What will be the approach If all the features are categorical in Linear Regression. Q3. What is Dummy variable trap? If we don't remove dummy variable what will be the issue and does it impact performa...read more
Ans. 
Categorical features in Linear Regression require encoding using dummy variables. Removing one dummy variable avoids the dummy variable trap.
• Categorical features need to be encoded using dummy variables to be used in Linear Regression

• Dummy variable trap occurs when one dummy variable can be predicted from the others

• Removing one dummy variable avoids the issue of multicollinearity and improves model performance

• Example: ...read more
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Q3. Q4. You are standing in a field. Chances of seeing atleast 1 plane in 10 minutes is 15%. What is the probability of seeing atleast 1 plane in next 30 minutes?
Ans. 
Probability of seeing a plane in 30 minutes given 15% chance in 10 minutes.
• Calculate the probability of not seeing a plane in 10 minutes

• Use the formula P(X>=1) = 1 - P(X=0)

• Calculate the probability of not seeing a plane in 30 minutes using the above probability

• Calculate the probability of seeing atleast 1 plane in 30 minutes using the formula P(X>=1) = 1 - P(X=0)
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Q4. Q5. If we select a random point in a circle of 1 unit radius what is the probability of appearing that point closer to the circumference , not closer to the centre.
Ans. 
Probability of a random point in a circle of 1 unit radius being closer to the circumference than the center.
• The probability is 1/4 or approximately 0.785.

• This is because the area of the circle closer to the circumference is 1/4th of the total area.

• This can be calculated using the formula for the area of a circle: A = πr^2.
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Q1. 2 python programming questions
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Q1. Why accuracy score should not be used on imbalanced dataset?
Ans. 
Accuracy score can be misleading on imbalanced datasets.
• Accuracy score can be high even if the model is not performing well on the minority class.

• F1 score, precision, and recall are better metrics for imbalanced datasets.

• Stratified sampling, oversampling, and undersampling can help balance the dataset.

• Example: A model predicting cancer in a dataset with only 1% positive cases.

• Using accuracy score, a model that always p...read more
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Q1. Sample T test. What is it?
Ans. 
Sample T test is a statistical test used to determine if there is a significant difference between the means of two groups.
• It is used to compare the means of two groups.

• It assumes that the data is normally distributed.

• It is commonly used in research studies to determine if a treatment has a significant effect.

• Example: A sample T test can be used to compare the mean weight of two groups of people who followed different
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Q2. What is P-value in regression summary?
Ans. 
P-value in regression summary measures the probability of observing a test statistic as extreme as the one computed from the sample data.
• P-value is used to determine the statistical significance of the regression coefficient.

• A low P-value (less than 0.05) indicates that the coefficient is statistically significant.

• A high P-value (greater than 0.05) indicates that the coefficient is not statistically significant.

• P-value...read more
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Q1. Python manipulating arrays
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Q2. Lambda functions, ML basic, Probability, puzzle
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Q1. Aptitude, ML basic, bias vs variance, RF in depth questions, projects discussion
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Hacker earth coding test is there

Q1. What are your salary expectations?
Ans. 
I am open to discussing salary based on the responsibilities and expectations of the Senior Analyst role.
• I am flexible and open to negotiation.

• I would like to be compensated fairly for my skills and experience.

• I am interested in the overall compensation package, including benefits and opportunities for growth.

• I would appreciate discussing the salary range for this position.

• I am confident that we can come to a mutually
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Q1. Share details of your previous job.
Ans. 
I worked as a Senior Analyst at XYZ Company.
• Analyzed data and provided insights to support decision-making

• Developed and maintained complex financial models

• Collaborated with cross-functional teams to identify opportunities for process improvement

• Presented findings and recommendations to senior management

• Managed and mentored a team of junior analysts
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