Statistics Interview Questions | Glassdoor

# Statistics Interview Questions

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interview questions shared by candidates

## Statistics Interview Questions

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Sep 12, 2013

### Software Engineering at AppFirst was asked...

Mar 11, 2010
 Given a coin flipping game, in which player A looks for the sequence HTH and player B looks for the sequence HTT, what is the probability that player A encounters its sequence first (and the game ends)? 2 Answers My probability skills are not too hot. After some stumbling around and speaking through my thought-process, we began building a finite state machine modeling coin flips. A solution would analyze the number of possible paths from the start node to an end node. This introduced infinite sums. Was a good opportunity to demonstrate my thinking process in the face of some unknown problem. I wonder if there is a typo in the question. If it is as it is B wins: HTH A wins: HTT Both of them need to wait till the first HT pattern comes up. The only difference lies in the last flip. Both have 1/2 chance to win. Hence, P(HTH before HTT) = 1/2

### Senior Scientist/Engineer at Complete Genomics was asked...

Sep 23, 2014
 how would you diagnose a hardware system that was having excessive signal to noise problems from a camera that measures fluorescent signals? 1 Answer My first replies went to defining signal/noise in their situation (fluorescent imaging) , which was not the same as what I was accustomed to in semiconductors. Once the definitions were clear, the discussion went fine.

### Financial Analyst - Derivatives at Goldman Sachs was asked...

May 24, 2010
 Given a random variable X and its distribution P(X), and a function y(x), what can you tell me about the distribution P(y(x))? 1 Answer Depends on the function! Take normal vs. lognormal distribution as an example. If P(X)=normal, and y(x)=exp(x), then P(Y)=lognormal.

### Data Analyst at PayScale was asked...

Sep 15, 2014
 Certain statistical questions regarding how to account for error in your normal statistical distribution 1 Answer I answered this using standard statistics terminology like standard deviations on the bell curve, but they were expecting an answer that dealt more with percentiles

### Consumer Insight Internship at Walt Disney Company was asked...

Feb 3, 2012
 What computer software do you use? 1 Answer I Use Microsoft Word, Power point, Excel, Outlook, and SPSS.

### Office Assistant at Berea College was asked...

Apr 20, 2012
 Why should I hire you? 1 Answer I am a team leader and have had extensive training in the use of microsoft excel. I am a self-starter, able to complete jobs quickly and correctly, and would do well in a detail-oriented position. I have had analytical experience through my Psychology major and have had classes pertaining to nothing other than statistical reasoning and reporting.

### Financial Analyst - Derivatives at Goldman Sachs was asked...

May 24, 2010
 Can you tell me the formula for sample variance? Is this formula biased, and if so, prove it! 2 Answers sigma = mean^2 of the sample - (mean of the sample)^2 Yes, it is biased, look up the proof on wikipedia. S^2 is an unbiased estimator of sigma^2