Data Analysis Online Test
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The Data Analysis online test evaluates the ability to inspect, analyze, interpret, and model data to discover insights and support decision-making.
The assessment includes work-sample tasks such as:
- Detecting and addressing collinearity issues in datasets.
- Conducting descriptive analysis to summarize data characteristics.
- Conducting significance tests to validate hypotheses.
A proficient data analyst must be skilled at identifying key data patterns, ensuring the reliability of statistical models, and drawing valid conclusions to guide decision-making.
Sample public questions
Each day during 2019 an agency asked a hundred randomly selected people which party they would vote for if elections were held that day. Results of the poll were recorded in the following file. The Workers' Party asked for the report which they plan to use to improve their strategy for upcoming elections.
Fill in the missing values in the report for 2019:
- The arithmetic mean of votes for the Workers' Party is: __ (rounded to one decimal place)
- The median of votes for the Workers' party is: __ (rounded to closest integer)
- The standard deviation of votes for the Workers' party is: __ (rounded to one decimal place)
- The difference between the largest and the smallest number of votes for the Workers' party for March is: __
- The largest number of votes that any party received on any day is: __ votes.
That maximum was achieved on 2019-__-__ by __. - The party with the largest difference between the maximum and minimum number of votes is _______. That difference is __ votes.
Two bacteria cultures, A and B, were set up in two different dishes, each covering 50% of its dish. Over 20 days, bacteria A's percentage of coverage increased to 70% and bacteria B's percentage of coverage reduced to 40%:
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18 more premium Data Analysis questions
Cheating Indicator, Distribution of Answers, Credit Wizard, Rain, Age and Earnings, Hiring Process, Billiard Club Occupancy, Patient Classification, Subscribers, Bank Loan, Occupancy Rate, New Manufacturing Method, Website Design Improvement, Sales Forecast, Wine Quality, Bacterial Growth, CTR, House Price Prediction.
Skills and topics tested
- Data Science
- Bayes' Theorem
- Probability
- Probability Distributions
- Decision Tree
- Classification
- ROC
- Linear Regression
- Machine Learning
- Outliers
- Decision Boundary
- Poisson Distribution
- Correlation
- Data Analysis
- Feature Selection
- ANOVA
- Significance Testing
- Forecasting
- Multicollinearity
- Curve Fitting
- Binomial Distribution
- P-Value
For job roles
- Data Analyst
Sample candidate report
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What others say
Simple, straight-forward technical testing
TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.
Jan Opperman, Grindrod Bank
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