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EMC Dell Data Scientist and Big Data Analytics Foundations 2023 Sample Questions (Q204-Q209):

NEW QUESTION # 204
Under which circumstance do you need to implement N-fold cross-validation after creating a regression model?

A. There are missing values in the data.
B. There are categorical variables in the model.
C. The data is unformatted.
D. There is not enough data to create a test set.

Answer: D

NEW QUESTION # 205
An analyst is searching a corpus of documents for the topic "solid state disk". As shown in the graphic, Table A provides the inverse document frequency for each term across the corpus.
Table B provides each term's frequency in four documents selected from the corpus.

Based on the four documents, which document is most relevant to the analyst's search?

A. Document B
B. Document A
C. Document C
D. Document D

Answer: D

NEW QUESTION # 206
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. Lag 7 has a significant negative autocorrelation
C. There is significant autocorrelation through lag 3
D. Differencing is required before proceeding with any analysis

Answer: C

NEW QUESTION # 207
A data scientist is asked to implement an article recommendation feature for an online magazine. The magazine does not want to use client tracking technologies such as cookies or reading history.
Therefore, only the style and subject matter of the current article is available for making recommendations.
All of the magazine's articles are stored in a database in a format suitable for analytics.
Which method should the data scientist try first?

A. Naive Bayesian
B. K Means Clustering
C. Association Rules
D. Logistic Regression

Answer: B

NEW QUESTION # 208
When is a Wilcoxon Rank-Sum test used?

A. When the data cannot be easily sorted
B. When the data can be easily sorted
C. When the populations represent the sums of other values
D. When an assumption about the distribution of the populations cannot be made

Answer: D

NEW QUESTION # 209
......

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