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EMC Dell Data Science Foundations Sample Questions (Q72-Q77):

NEW QUESTION # 72
What is an appropriate assignment for a data scientist?

A. Monitor key performance indicators
B. Conduct customer surveys
C. Develop predictive models
D. Define an OLAP database schema

Answer: C

NEW QUESTION # 73
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?

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

Answer: C

NEW QUESTION # 74
You are using MADlib for Linear Regression analysis.
Which value does the statement return?
SELECT (linregr(depvar, indepvar)).r2 FROM zeta1;

A. Goodness of fit
B. Standard error
C. P-value
D. Coefficients

Answer: A

NEW QUESTION # 75
On which type of data should you run K-means clustering?

A. Numeric
B. Nominal
C. Text
D. Ordinal

Answer: A

Explanation:
K-means clustering is best suited for numeric data, as it relies on calculating the Euclidean distance between data points, which is meaningful for numerical values.

NEW QUESTION # 76
In which lifecycle stage are test and training data sets created?

A. Model building
B. Data preparation
C. Discovery
D. Model planning

Answer: A

NEW QUESTION # 77
......

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