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

Question : Refer to the Exhibit.
You are working on creating an OLAP query that outputs several rows of with summary rows of
subtotals and grand totals in addition to regular rows that may contain NULL as shown in the
exhibit. Which function can you use in your query to distinguish the row from a regular row to a
subtotal row?


1. GROUPING
2. RANK
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4. ROLLUP



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Question : Refer to the exhibit.
After analyzing a dataset, you report findings to your team:
1. Variables A and C are significantly and positively impacting the dependent variable.
2. Variable B is significantly and negatively impacting the dependent variable.
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After seeing your findings, the majority of your team agreed that variable B should be positively
impacting the dependent variable.
What is a possible reason the coefficient for variable B was negative and not positive?


1. The information gain from variable B is already provided by another variable
2. Variable B needs a quadratic transformation due to its relationship to the dependent variable
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4. Variable B needs a logarithmic transformation due to its relationship to the dependent variable



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Question : Refer to the exhibit.
You have run a linear regression model against your data, and have plotted true outcome versus
predicted outcome. The R-squared of your model is 0.75. What is your assessment of the model?

1. The R-squared may be biased upwards by the extreme-valued outcomes. Remove them and
refit to get a better idea of the model's quality over typical data.
2. The R-squared is good. The model should perform well.
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see if the R-squared improves over typical data.
4. The observations seem to come from two different populations, but this model fits them both
equally well.



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Related Questions

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Question : In R, functions like plot() and hist() are known as what?

1. generic functions
2. virtual methods
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4. generic methods





Question : Review the following code:
SELECT pn, vn, sum(prc*qty)
FROM sale
GROUP BY CUBE(pn, vn)
ORDER BY 1, 2, 3;
Which combination of subtotals do you expect to be returned by the query?


1. (pn, vn)
2. ( (pn, vn), (pn) )
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4. ( (pn, vn) , (pn), (vn) , ( ) )



Question : In MADlib what does MAD stand for?


1. Machine Learning, Algorithms for Databases
2. Mathematical Algorithms for Databases
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4. Modular, Accurate, Dependable


Question : The web analytics team uses Hadoop to process access logs. They now want to correlate this
data with structured user data residing in their massively parallel database. Which tool should they
use to export the structured data from Hadoop?


1. Sqoop
2. Pig
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4. Scribe



Question : When would you prefer a Naive Bayes model to a logistic regression model for classification?


1. When some of the input variables might be correlated
2. When all the input variables are numerical.
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4. When you are using several categorical input variables with over 1000 possible values each.



Question : Before you build an ARMA model, how can you tell if your time series is weakly stationary?


1. The mean of the series is close to 0.
2. The series is normally distributed.
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4. There appears to be no apparent trend component