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EMC Associate - Data Science and Big Data Analytics v2 Exam Sample Questions (Q27-Q32):

NEW QUESTION # 27
A data scientist plans to classify the sentiment polarity of 10, 000 product reviews collected from the Internet. What is the most appropriate model to use? Suppose labeled training data is available.
Response:
Naive Bayesian classifier

A. Logistic regression
B. Linear regression
C. K-means clustering

Answer: B

NEW QUESTION # 28
What describes a true property of Logistic Regression method?
Response:

A. It works well with variables that affect the outcome in a discontinuous way.
B. It handles missing values well.
C. It works well with discrete variables that have many distinct values.
D. It is robust with redundant variables and correlated variables.

Answer: D

NEW QUESTION # 29
You are using k-means clustering to classify heart patients for a hospital. You have chosen Patient Sex, Height, Weight, Age and Income as measures and have used 3 clusters.
When you create a pair-wise plot of the clusters, you notice that there is significant overlap between the clusters. What should you do?
Response:

A. Remove one of the measures
B. Identify additional measures to add to the analysis
C. Decrease the number of clusters
D. Increase the number of clusters

Answer: C

NEW QUESTION # 30
Which SQL OLAP extension provides all possible grouping combinations?
Response:

A. ROLLUP
B. CROSS JOIN
C. CUBE
D. UNION ALL

Answer: C

NEW QUESTION # 31
You do a Student's t-test to compare the average test scores of sample groups from populations A and B. Group A averaged 10 points higher than group B. You find that this difference is significant, with a p-value of 0.03.
What does that mean?
Response:

A. The difference in scores between a sample from population A and a sample from population B will tend to be within 3% of 10 points.
B. There is a 3% chance that a sample group from population A will score 10 points higher that a sample group from population B.
C. There is a 97% chance that a sample group from population A will score 10 points higher that a sample group from population B.
D. There is a 3% chance that you have identified a difference between the populations when in reality there is none.

Answer: D

NEW QUESTION # 32
......

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