EMC E20-065 Exam Questions Free Practice Test

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Questions # 11:

Why would a company decide to use HBase to replace an existing relational database?

Options:

It is required for performing ad-hoc queries.

Varying formats of input data requires columns to be added in real time.

The company's employees are already fluent in SQL.

Existing SQL code will run unchanged on HBase.

Expert Solution

Questions # 12:

What describes how nodes in a social network are similar to each other in characteristics?

Options:

Community clustering

Modularity

Homophily

Strongly tied network

Expert Solution

Questions # 13:

What is a property of a good color model for ordinal data?

Options:

Uses a rainbow-like color map for distinction of categories

Uses a rainbow-like color map for ease of display and printing

Uses perceptually ordinal colors with just-noticeable increments

Uses perceptually ordinal colors with linear, perceptual increments

Expert Solution

Questions # 14:

What elements are needed to determine the time complexity of finding all the cliques of size k in social network analysis?

Options:

Eigenvector centrality and betwenness

Clique size and total number of nodes in the network

Number of edges in the network and centrality measure of the cliques

Clique size and betweenness centrality

Expert Solution

Questions # 15:

You conduct a TFIDF analysis on 3 documents containing raw text and derive TFIDF ("data", document y) = 1.908. You know that the term "data” only appears in document 2.

What is the TF of “data" in document 2?

Options:

2 based on the following reasoning:

TFIDF = TF1DF = 1 908

You then know that IDF will equal LOG (32)=0.954

Therefore, TFIDF=TF*0.954 = 1.908

TF will then round to 2

4 based on the following reasoning:

TFIDF = TF1DF = 1.908

You then know that IDF will equal LOG (3/1 )=0.477

Therefore, TFIDF=TF'0 477 = 1.908

TF will then round to 4

6 based on the following reasoning:

TFIDF = TF1DF = 1.908

You then know that IDF will equal 3/1=3

Therefore, TFIDF=TF/3 = 1.908

TF will then round to 6

11 based on the following reasoning:

TFIDF = TF1DF = 1908

You then know that IDF will equal LOG(3/2)=0.176

Therefore, TFIDF=TF"0.176 = 1.908

TF will then round to 11

Expert Solution

Questions # 16:

What best describes the meaning behind the phrase "Six Degrees of Separation'"?

Options:

Ability to use about six hops to reach any other node in an extremely large social network

Erdos number of all scholars having written papers with Paul Erdos

Maximum number of edges between nodes in a graph with a diameter of six

Typical distance between nodes that are connected by triadic closure

Expert Solution

Questions # 17:

The naive Bayer classifier is trained over 1600 movie reviews and then tested over 400 reviews.

Here is the resulting confusion matrix:

190 (TP) 10(FN)

80 (FP) 120(TN)

What are the precision, recall, and the F1-score values?

Options:

Precision0.95; Recall: 0704; F1-score: 0.809

Precision 0.613, Recall: 0.95, F1-score: 0.745

Precision 0.704, Recall: 0.95; F1-score: 0.809

Precision 0.95; Recall: 0.613; F1-score: 0.745

Expert Solution

Questions # 18:

What do first-order and second-order Markov processes have in common concerning next word prediction?

Options:

Both use WordNet to model the probability of the next word

Both are unsupervised methods

Both provide the foundation to build a trigram language model

Neither makes assumptions about the probability of the next word

Expert Solution

Questions # 19:

What is an effective use of color in visualization?

Options:

Use self-explanatory colors so a legend is unnecessary

Maximize use of color to make a more lasting impression

Use high contrast colors such as red and blue

Minimize use of color except for emphasis

Expert Solution

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