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**Statistician**Interview Questions
1. Explain to me the 80/20 rule.

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**Statistician**Interview Questions- Explain to me the 80/20 rule.
- What was the largest data set that you processed? How did you process it?
- Would you say you are creative? When have you shown creativity?
- What studies have you worked on in the past?
- Why do you feel statistics are important?
- Do you have experience working with SQL?
- How do you like to present your data findings to your coworkers?
- How would you explain a p-value to a novice?
- Why is mean square error a bad measure of model performance?
- How would you rate your education? What things would you like to improve upon?
- Why did you enter a career in statistics?
- What do you know about our company?
- What is your dream data set, if you could have access to anything?
- What is model fitting?
- Tell me about a data project you have done that was successful. What made it successful?

**Statistician**Information

March 20th, 2014

Statistics is the scientific application of mathematical principles to the collection, analysis, and presentation of numerical data. Statisticians apply their mathematical and statistical knowledge to the design of surveys and experiments; the collection, processing, and analysis of data; and the interpretation of experiments and survey results. Opinion polls, statements about the accuracy of scales and other measuring devices, and information about average earnings in an occupation are all usually the work of statisticians.

bls.gov/oco/ocos045.htm

Statistics is the scientific application of mathematical principles to the collection, analysis, and presentation of numerical data. Statisticians apply their mathematical and statistical knowledge to the design of surveys and experiments; the collection, processing, and analysis of data; and the interpretation of experiments and survey results. Opinion polls, statements about the accuracy of scales and other measuring devices, and information about average earnings in an occupation are all usually the work of statisticians.

bls.gov/oco/ocos045.htm

**Statistician**User Submitted Interview Answers

Question

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Explain to me the 80/20 rule.

User Submitted Interview Answers

1.

The Pareto principle (also known as the 80â€“20 rule, for many events, roughly 80% of the effects come from 20% of the causes. "80% of your sales come from 20% of your clients." 20% of the peapods in his garden contained 80% of the peas.

2.

Data split for training and testing.

Question

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What was the largest data set that you processed? How did you process it?

User Submitted Interview Answers

1.

My PhD project was based on a cohort, which contained more than 6k participants.

2.

Repeated measures data using mixed models.

3.

I have processed Census data in a research project, I processed it by performing several analysis on the data. Such as, the well know mean, mode and median of different variables. I havve also performed the frequencies of diferent variables. From there, I had to perform variaty of testings to see if the data is following a normal distribution curve. If not, I had to remove all the outliers in order to make the data normal. Using quality control meansures.

4.

A dataset with more than 2000 patients and more than 50 variables. I formatted and labeled it with SAS.

5.

The biggest data set I processed is 6000*874, which need to be classified.

Question

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Would you say you are creative? When have you shown creativity?

User Submitted Interview Answers

1.

Yes. Working as a biostatistician, I alway face the problem that the real case is much more complicated than expected, such as missing values, complex study design, clustered or correlated covariates and some ethical issues. Thus we cannot simply apply a statistical model to solve the problem. I showed my creativity when making choices from applicable methods.

2.

Yes I am very creative. I have a lot of skills with spreadhseet, and data management. Creating graphs, tables, pie charts etc is something that I excel in. I have recently had to create charts and graphs for a project that I am working on and I got to show my creativity with the design and details.

3.

Yes I am very creative. I have a lot of skills with spreadsheet, and data management. Creating graphs, tables, pie charts etc. Is something that I excel in. I have recently had to create charts and graphs for a project that I am working on and I got to show my creativity with the design and details.

4.

By drawing statistical conclusion.

5.

Yes. I find the best way to truly be creative is to be collaborative. When working with people from multiple backgrounds and view points, you can truly take parts of several ideas and come up with a solution that is both creative and appropriate. like developing visual tools to motivate people while increasing accountability.

Question

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What studies have you worked on in the past?

User Submitted Interview Answers

1.

In the past, I have worked on studies involving groups in the Adopt-A-Highway program. I have studied multiple financial data groups and anazlyzed the information to make sure everything is correct.

2.

I am trying to apply statistics in the relations between countries in the new global climate.

3.

Except dose/response Phase I (only one), I have worked on preclincal animal's model (cardiology, neurology ...) study pilot, Phase II and III : from placebo controlled to therapeutic stregaies, including.

4.

I have done a study on Forecasting electricity demand for Windhoek residence, for my Honours research.

5.

Enviornmental air quality studies.

Question

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Why do you feel statistics are important?

User Submitted Interview Answers

1.

Statistics are important because it allows the public to be aware of the issues that are going on around them. If there werent people such as statisticians working to analyze and interpret large sets of data, there would be no collection of running statistics pertaining to a certain cause. It allows people to easily view and obtain informtaion on important topics.

2.

It gives us insight based on solid data, which we cannot get from other methods.

3.

They are very important because they are used in most of humans fields.

4.

Statistics is important because it help in policy and decision making.

5.

They are imprtant because they are resposible with concerting data into information and let the right users be aware of the happenings. They also inform strategical planners.

Question

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Do you have experience working with SQL?

Question

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7 of 35

How do you like to present your data findings to your coworkers?

User Submitted Interview Answers

1.

By ussing the statistical programs and In a computer screen.

2.

It depends of findings and coworkers. It could be outlayer which came from mistake. Statistic limitation, or un scientific concil if hypothesis are not different (glorious p value), but combiin.

3.

Using graphs and tables. As straightforward as possible.

4.

I like to present my data findings in a few ways. Sometimes the data I have collected is shown better in a simple excel chart. Other data findings are more easily understood in a graph or chart. How I present my data findings all depends on the type of data being researched and the best way to get that data a crossed to another person so they can easily understand it.

5.

In graphical presentation form.

Question

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8 of 35

How would you explain a p-value to a novice?

User Submitted Interview Answers

1.

The probability of obtaining a result equal to or "more extreme" than what was actually observed.

2.

In frequentist statistics, the p-value is a function of the observed sample results (a test statistic) relative to a statistical model, which measures how extreme the observation is. The p-value is the probability that the observed result has nothing to do with what one is actually testing for. Specifically, the p-value is defined as the probability of obtaining a result equal to or "more extreme" than what was actually observed, assuming that the model is true.[1][2] There are different definitions of "extreme"; see definition below.

3.

Probability of having the same result of a more extreme one assuming that H0 is true.

4.

Its a propability value that can be used after decisions of the statistical tests.

Question

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Why is mean square error a bad measure of model performance?

User Submitted Interview Answers

1.

The answers to questions like this usually boil down to how the model is being used.
Suppose you are a store owner using a model to predict how many widgets to stock. If you under-predict, you lose the profit on the widgets you could have sold. If you over-predict, you have to deal with the extra widgets on your shelves. Perhaps the widgets are spoiling. The costs of overpredicting may be different from the costs of underpredicting, and these costs are in dollars, so there is no reason to be squaring things. This is an example where squared error may not make sense.

2.

In statistics, the mean squared error (MSE) or mean squared deviation (MSD) of an estimator measures the average of the squares of the errors or deviations, that is, the difference between the estimator and what is estimated. MSE is a risk function, corresponding to the expected value of the squared error loss or quadratic loss. The difference occurs because of randomness or because the estimator doesn't account for information that could produce a more accurate estimate.[1]

3.

One case where MSE will be a bad measure is those cases where linear regressionâ€™s assumption are violated.
Also, the mean squared error can only be compared between models whose errors are measured in the same units.

4.

When it is under predicted or over predicting.

Question

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How would you rate your education? What things would you like to improve upon?

User Submitted Interview Answers

1.

My education level is up to standard. I would like to continue with my study to again an advanced level.

2.

Excellent. Advances in medicinal field.

3.

I would rate my education as a proficient in statistical background, I would love to improve on my existing skills on some of the statistical packages, for more kknowledge attainment.

4.

I think my Master program education in biostatistics can be rated as 9. On one side, I am enrolled in one of the top universities in the world. The professors taught me are leading thinkers in biostatistics. On the other side, I am a straight A student and excel at most every class. I would like to improve upon the application in practice of what I have learnt.

Question

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Why did you enter a career in statistics?

User Submitted Interview Answers

1.

Via foundation degree in maths.

2.

Because i had a liking for maths and moreover its application..so i opted for statistics as my career.

3.

My education at university which was statistics give me prominency to choose this kind of career.

4.

With statistics we can take any decision in any condition.it gives us future requirement so we know advance requirement for future.

Question

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What do you know about our company?

Question

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13 of 35

What is your dream data set, if you could have access to anything?

Question

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14 of 35

What is model fitting?

Question

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15 of 35

Tell me about a data project you have done that was successful. What made it successful?

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