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EMC Dell Data Scientist and Big Data Analytics Foundations 2023 Sample Questions:

1. Which ROC curve represents a perfect model fit?
A)

B)

C)

D)

A) Exhibit C
B) Exhibit D
C) Exhibit B
D) Exhibit A

2. Trend, seasonal, and cyclical are components of a time series.
What is another component?

A) Irregular
B) Exponential
C) Linear
D) Quadratic

3. A data scientist is given an R data frame (i.e., empdata) with the following columns: Age Salary Occupation Education Gender The scientist wants to examine only the Salary and Occupation columns for ages greater than '40'.
Which command extracts the appropriate rows and columns from the data frame?

A) empdata[, c("Salary","Occupation")]$Age > 40
B) empdata[c("Salary","Occupation"), empdata$Age > 40]
C) empdata[empdata$Age > 40, c("Salary","Occupation")]
D) empdata[Age > 40, ("Salary","Occupation")]

4. 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 D
B) Document B
C) Document C
D) Document A

5. What describes the use of UNION clause in a SQL statement?

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

Solutions: