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Sollicitatievragen voor Data Intern gedeeld door sollicitanten

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Er werd een Data Scientist Intern gevraagd...25 februari 2012

### Find the second largest element in a Binary Search Tree

15 antwoorden

The above answer is also wrong; Node findSceondLargest(Node root) { // If tree is null or is single node only, return null (no second largest) if (root==null || (root.left==null &amp;&amp; root.right==null)) return null; Node parent = null, child = root; // find the right most child while (child.right!=null) { parent = child; child = child.right; } // if the right most child has no left child, then it's parent is second largest if (child.left==null) return parent; // otherwise, return left child's rightmost child as second largest child = child.left; while (child.right!=null) child = child.right; return child; } Minder

find the right most element. If this is a right node with no children, return its parent. if this is not, return the largest element of its left child. Minder

One addition is the situation where the tree has no right branch (root is largest). In this special case, it does not have a parent. So it's better to keep track of parent and current pointers, if different, the original method by the candidate works well, if the same (which means the root situation), find the largest of its left branch. Minder

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### Given two lists of sorted integers, develop an algorithm to sort these numbers into a single list efficiently.

4 antwoorden

This might be solved by using a similar logic we used for the merge procedure in merge sort Minder

The key in these questions is to cover the fundamentals, and be ready for the back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Quora or ex-Quora Data Scientist Intern experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews Minder

I think what SAS does to this issue could be referred as one solution

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### 15 mins with an HR Recruiter followed by 1 Hour Technical Interview with 3 Data Scientist's - Case Studies on Sales Prediction. The interviewers were knowledgeable and the questions they asked were relevant to the intern job requirements.

2 antwoorden

Brieflfy

can you give more details?

### For the first round audio interview: 1. multicollinearity 2. decision trees 3. end-to-end method for deep learning on a genomic dataset For the video interview: 1. what is the most challenging aspect of data science projects for you 2. describe projects on resume 3. how do you communicate

2 antwoorden

Can you please tell me when you heard back from them after the hirevue interview? Minder

### How would you avoid over-fitting from a machine learning model ? Describe different methods

2 antwoorden

Drop-out technique in deep neural networks

1. Add a regularisation term 2. Use test data and do cross validation (like k-fold) 3. Use PCA and SVD to reduce dimensionality. Minder

### What is a stock and a bond?

1 antwoorden

Stock: ownership in a company. Common stock – sometimes receives dividends and have voting rights. Preferred – first to receive dividends but does not have voting rights. Bond: Form of debt similar to a loan. Issuer is obliged to pay interest (the coupon) and to repay the principal at a later date. Corporate Bonds, Muni bonds, Even Asset backed securities are a type of bonds (Mortgage backed securities) Minder

### Questions from algebra, algorithms and data science. Writing Python code to solve some simple tasks like creating a counter of distinct elements from a list, an algorithm to compute a^b without using the ** operator in Python.

2 antwoorden

I was able to answer most of the algebra and algorithms questions. Couldn't answer some of the Data Science ones. I was able to write a code for computing a^b assuming b was an integer, but couldn't do it for the general case - when b could be any real number. Minder

I'm assuming that you can't use any mathematical library.You need to write an if elif else condition, if b could be any real number. If b is a negative number then output should be inverse of a^b . Similarly if b is a fraction ,different condition should be mentioned. Minder

### Case study question and simple SQL questions.

2 antwoorden

May I know how many rounds of interview did u take? Thank u

Hey, do you mind if you provide a bit more info on your round two and three questions? Thanks a lot! Minder

### "Explain experience working with Tableau"

2 antwoorden

My experience is utility opretion and maintenance.

Utilities power consumption and plant side m/c power seving.

### Are you a hard worker or a smart worker?

2 antwoorden

Hard worker

I choose hardworking or over smart work because hardworking never fails..

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