Dell EMC Data Science Associate Certification Questions and Answers (Dumps and Practice Questions)

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
3. It is not normalized
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
3. Main message is to context
4. Pie chart is to proportions




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


1. XML data file
2. Database table
3. Webserver log
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
3. Hive
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
3. The estimated coefficient is greater than 3
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
3. scatterplot
4. binplot