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Junior Data Scientist was asked...5 January 2017

If a jar has X red balls and Y blue balls, what is the minimum number of draws that is necessary to ensure that you have one ball of each color?

3 Answers

It is max, the first reply was correct. I you have 5 blue balls and 2 red balls : - If it was min : you take 3 balls, it is still possible to have picked 3 blue balls. - with max : you take 6 balls, the worst case is that you have picked 5 blue and 1 red balls. Less

max(X, Y)+1

min(X,Y) + 1 is correct, not max()


How would you query an SQL database with Tera of data?

2 Answers

Not sure of the answer but would try to partition my query.

I would probably batch my data


If the coefficient of an independent variable in linear regression has an opposite sign than it should be, what might be the reason

1 Answers


Introductory questions. Describing yourself. Your skills. Your past experiences. Presentation of a Case Study that was provided a few days before the interview.

1 Answers

I answered honestly. I sounded genuine and friendly. Smiling all the time. Presented the Case Study and answered the questions that followed. Less

Tell us about your programming learning experience?

1 Answers

Talked about my learning experience

Are you a challenging person?

1 Answers

I said yes


What do you know about the company?

1 Answers

Their CEO, what they do

Groundwater Environmental Services

Inquired about my ability to perform essential functions, my desire to learn and accept responsibility, and my ability to travel if need be.

1 Answers

I said I could perform all of the functions, that I want to learn and have responsibility, and that traveling for long periods of time is not my first choice but I would do what I had to do. Less

Schwarz Dienstleistungen

Wann benutzt man Decision Trees, wann Neuronale Netze? Wenn ein neuronales Netz 90% Accuracy auf dem Training Set hat, aber 50% auf dem Test Set, was haben wir dann? -> Overfitting ..Basics zu Machine Learning


If you have a bag of jelly beans with a large number of two different colors, whats the minimum you need to pick out to guarantee that you have at least 2 of the same color? Then the question in the general case.

1 Answers

3, and for the general case picking m with the same color from n classes you'd need: m * n + 1. Use "worst case scenario" analysis. Less

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