Dell EMC Data Science and BigData Certification Questions and Answers

Question : Which SQL OLAP extension provides all possible grouping combinations?


1. ROLLUP
2. UNION ALL
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4. CROSS JOIN



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Exp: A cube can be considered a multi-dimensional generalization of a two- or three-dimensional spreadsheet. For example, a company might wish to summarize financial data by product, by time-period, and by city to
compare actual and budget expenses. Product, time, city and scenario (actual and budget) are the data's dimensions.[3]

Cube is a shortcut for multidimensional dataset, given that data can have an arbitrary number of dimensions. The term hypercube is sometimes used, especially for data with more than three dimensions.

Slicer is a term for a dimension which is held constant for all cells so that multidimensional information can be shown in a two dimensional physical space of a spreadsheet or pivot table.

Each cell of the cube holds a number that represents some measure of the business, such as sales, profits, expenses, budget and forecast.

OLAP data is typically stored in a star schema or snowflake schema in a relational data warehouse or in a special-purpose data management system. Measures are derived from the records in the fact table and dimensions
are derived from the dimension tables.






Question : What is the primary bottleneck in text classification?


1. The ability to parse unstructured text data.
2. The availablilty of tagged training data.
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4. The fact that text corpora are dynamic.




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Exp:







Question : Which characteristic applies only to Business Intelligence as opposed to Data Science?



1. Uses only structured data
2. Supports solving "what if" scenarios
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4. Uses predictive modeling techniques



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Exp:

Related Questions

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Question : A Data Scientist is assigned to build a model from a reporting data warehouse. The warehouse
contains data collected from many sources and transformed through a complex, multi-stage ETL
process. What is a concern the data scientist should have about the data?



1. It is too processed
2. It is not structured
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4. It is too centralized






Question : Which word or phrase completes the statement? Emphasis color is to standard color as _______ .



1. Main message is to key findings
2. Frequent item set is to item
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4. Pie chart is to proportions




Question : Which data asset is an example of semi-structured data?


1. XML data file
2. Database table
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4. News article




Question : Your colleague, who is new to Hadoop, approaches you with a question. They want to know how
best to access their data. This colleague has previously worked extensively with SQL and
databases.
Which query interface would you recommend?



1. Flume
2. Pig
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4. HBase


Question : In linear regression, what indicates that an estimated coefficient is significantly different than zero?


1. R-squared near 1
2. R-squared near 0
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4. A small p-value





Question : Which graphical representation shows the distribution and multiple summary statistics of a
continuous variable for each value of a corresponding discrete variable?


1. box and whisker plot
2. dotplot
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4. binplot