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EMC Dell Data Science Foundations Sample Questions (Q341-Q346):

NEW QUESTION # 341
What describes the use of UNION clause in a SQL statement?

A. Operates on queries and potentially decreases the number of rows
B. Operates on tables and potentially decreases the number of columns
C. Operates on both tables and queries and potentially increases both the number of rows and columns
D. Operates on queries and potentially increases the number of rows

Answer: D

NEW QUESTION # 342
In which lifecycle stage are initial hypotheses formed?

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

Answer: C

NEW QUESTION # 343
Refer to the exhibit.

In the exhibit, a correlogram is provided based on an autocorrelation analysis of a sample dataset.
What can you conclude from only this exhibit?

A. There is no structure left to model in the data
B. Differencing is required before proceeding with any analysis
C. Lag 7 has a significant negative autocorrelation
D. There is significant autocorrelation through lag 3

Answer: D

NEW QUESTION # 344
Which two analytical methods can be used for dealing with categorical variables with a large number of levels?

A. Logistic Regression and ARMA
B. Linear Regression and Association Rules
C. Naïve Bayesian and Linear Regression
D. Naïve Bayesian and Decision Tree

Answer: D

NEW QUESTION # 345
On analyzing the results of a K-means clustering output, you noticed that splits on variables you expected to see were not observed.
What actions should be taken?

A. Increase the value of K
B. Use the value of K where the value of WSS given for K represents the overall dispersion of the data
C. Decrease the number of variables in the model
D. Decrease the value of K

Answer: A

NEW QUESTION # 346
......

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