Dell EMC Data Science and BigData Certification Questions and Answers

Question : Refer to the exhibit
You ran a linear regression, and the final output is seen in the exhibit.
Based only on the information in the exhibit and an acceptable confidence level of 95%, how
would you interpret the interaction of variable D with the dependent variable?

1. In this model, Variable D is not significantly interacting with the dependent variable
2. For every 1 unit increase in variable D, holding all other variables constant, we can expect the
dependent variable to increase by 10.23 units
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dependent variable to be multiplied by 10.23 units
4. Variable D is more significant than variables A, B, and C.



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Question : Refer to the exhibit.
The graph represents an ROC space with four classifiers labelled A through D. Which point in the
graph represents a perfect classification?

1. Q
2. P
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4. R



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Question : Refer to the exhibit
Consider the training data set shown in the exhibit. What are the classification (Y = 0 or 1) and the
probability of the classification for the tuple
X(1, 0, 0)
using Naive Bayesian classifier?


1. Classification Y = 1, Probability = 4/54
2. Classification Y = 0, Probability = 4/54
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4. Classification Y = 1, Probability = 1/54



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Related Questions

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


1. Data dashboards
2. Focus on structured data
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4. Advanced analytical methods




Question : Which word or phrase completes the statement?
Theater actor is to "Artistic and Expressive" as Data Scientist is to ________________


1. Introverted and Technical
2. Logical and Steadfast
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4. Communicative and Collaborative




Question : Which process in text analysis can be used to reduce dimensionality?


1. Parsing
2. Stemming
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4. Sorting




Question : What is the format of the output from the Map function of MapReduce?


1. Key-value pairs
2. Binary respresentation of keys concatenated with structured data
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4. Unique key record and separate records of all possible values




Question : Which data type value is used for the observed response variable in a logistic regression model?


1. Any integer
2. Any positive real number
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4. A binary value




Question : A data scientist is given an R data frame, "empdata", with the columns Age, Salary, Occupation,
Education, and Gender. The data scientist would like to examine only the Salary and Occupation
columns for ages greater than 40. Which command extracts the appropriate rows and columns
from the data frame?


1. empdata[c("Salary", "Occupation"), empdata$Age > 40]
2. empdata[Age > 40, ("Salary", "Occupation")]
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4. empdata[, c("Salary", "Occupation")]$Age > 40