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EMC Dell Data Science Foundations Sample Questions (Q171-Q176):

NEW QUESTION # 171

Refer to the exhibit.
What is the approximate R-squared value for a linear regression model fitted to the data associated with this scatterplot?

A. 0.96
B. 0
C. 0.25
D. 1

Answer: A

Explanation:
The R-squared value is approximately 0.96, indicating that 96% of the variance in the data is explained by the model.

NEW QUESTION # 172
Which chart type is intended to display correlations between sets of numeric data?

A. Pie chart
B. Histogram
C. Line Chart
D. Scatterplot

Answer: D

NEW QUESTION # 173
The web analytics team uses Hadoop to process access logs. They now want to correlate this data with structured user data residing in a production single-instance JDBC database. They collaborate with the production team to import the data into Hadoop.
Which tool should they use?

A. Sqoop
B. Scribe
C. Chukwa
D. Pig

Answer: A

NEW QUESTION # 174
What is the format of the output from the Map function of MapReduce?

A. Compressed index
B. Binary respresentation of keys concatenated with structured data
C. Unique key record and separate records of all possible values
D. Key-value pairs

Answer: D

NEW QUESTION # 175
You are attempting to find the Euclidean distance between two centroids:
Centroid A's coordinates: (X = 2, Y = 4)
Centroid B's coordinates (X = 8, Y = 10)
Which formula finds the correct Euclidean distance?

A. ((2-8)2+(4-10)2) or 72
B. ((2-8) x 2 + (4-10) x 2) or 148
C. SQRT(((2-8) x 2) + ((4-10) x 2)) or 12.17
D. SQRT((2-8)2+(4-10)2) or 8.49

Answer: D

NEW QUESTION # 176
......

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