# Research scientist Interview Questions

# 3K

Research Scientist interview questions shared by candidates### What's your strengths for this position

5 Answers### Throw a fair die 100 times, what is the probability that you will get more than 75 tails?

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Umm...A die has six faces, so what's "heads"?

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You add up the binomial distribution for k = 76 to 100, i.e. (100 k) * p ^k * (1-p) ^ 100-k for p=1/2, where (100 k) is "100 choose k", the binomial coefficient. The idea is to figure out how many paths lead to each of the 101 final outcomes of the "tree" (which is defined by the "100 choose k" coefficients") and multiply each one by it's probability. Pascal's triangle makes things easy to think about. Less

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Approximate a Binomial distribution by a normal distribution.

### How to build a dictionary in such a way that it'd be efficient to search for all valid words which are permutations of a given string?

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For each word in a dictionary as a value, build a key which is composed of lexicographically ordered characters. For example, value = apple key = aelpp. value = ocotopus key = cooopstu Then build an index from the keys, and you'll have all of the words that can be generated from re-ordering the elements. The result is efficient at run-time because it's constant run time. The construction of the index is also efficient because it only needs to run linearly, once. Less

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Perhaps use a function of the sum of the string's char codes (and its length?) as a key in a first hashtable. This key should link to a second hashtable that would directly index each particular permutation of the word. Less

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Hash table

### In the Phone interview, they went through my resumes. In the on-site interview, I was asked to give a 15 min proposal presentation based on the topic they applied.

3 Answers↳

After the onsite interview did Toyota contact you regarding their decision?

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A week later, I got an rejection email...

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A week later, I got an rejection email...

### A little rude to statisticians.

3 Answers↳

What is the point of writing this review, when you do not tell what questions you were asked? What do you expect a reader to take away (learn and use) from your review? Less

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What is the point of writing this review, when you do not tell what questions you were asked? What do you expect a reader to take away (learn and use) from your review? Less

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What is the point of writing this review, when you do not tell what questions you were asked? What do you expect a reader to take away (learn and use) from your review? Less

### Why do you want to work for DRDO

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blah blah ......

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because it provide me a pathway for long distance

### What was the time you had to follow the group decision you disagreed with? What is the most innovative research worked on? What was the impact?

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The onsite interview was very very long. 5 interviews which took an hour each.

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Hi! As an Amazon employee who interviewed and hired a lot of people here, I've created a guide that has all the questions and winning answers from an Amazonian recruiter perspective. Please check it out at interviewjoy.com/services/interview-process-details/amazon-senior-manager-interview-questions/ . Pls also check the positive feedback at the bottom of that page! Thanks. Less