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Data Analyst

Interview Prep

QuestionAnswer
What is Data Mining? The process of finding relevant information which has not been found before.
What is Data Profiling? Is usually done to assess a dataset for it's uniqueness, consistency and logic.
What is Data Wrangling? The process of cleaning, structuring, enriching, validating, and analyzing the data.
What percent of data analytics is spent on Data Wrangling? 80%
What is step 3 of an analytics project? Data cleaning
What is step 2 of an analytics project? Data collection
What is step 1 of an analytics project? Understand the problem
What is step 4 of an analytics project? Data exploration and analysis
What is step 5 of an analytics project? Interpret the results
What are the 2 most important steps of an analytics project? Understand the problem & Interpret the results
What is the best practice for data cleaning? Make a plan by understanding where the common errors take place and keep communications open.
How can you handle missing values in a dataset? Listwise deletion
What is Listwise deletion? A method where an entire record is excluded from analysis if a single value is missing.
What is Average Imputation? Using the most common response from other participants to fill the missing value
How is Average Imputation useful? If a group of data doesn't have certain info needed, you could average it.
Wha t is Regression substitution? This is used to estimate a missing value.
What is Multiple imputation? It creates plausible values based on the correlations for missing data and then averages the simulated datasets by incorporating random errors in your predictions.
What is Normal Distribution? A type of continuous probability distribution that is symmetric about the mean and in a graph appears as a bell curve
What is a Time Series analysis? A statistical method that deals with ordered sequence of values of a variable at equally spaced time intervals.
What is Data Joining in Tableau? When the data comes from the same source, and share a common set of Dimensions and Measures.
What is Data Blending in Tableau? When the data comes from two or more different sources, and have their own set of Dimensions and Measures.
What is Overfitting? The performance drops significantly over the test set and the model learns the noise and random fluctuations in the training dataset in detail.
What is Underfitting?
In MS Excel, a numeric value can be treated as a text if it precedes with? Apostrophe
Created by: jroynon
 

 



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