DELL EMC D-DS-FN-23 Dell Data Science Foundations 2023 Online Training
DELL EMC D-DS-FN-23 Online Training
The questions for D-DS-FN-23 were last updated at Nov 19,2024.
- Exam Code: D-DS-FN-23
- Exam Name: Dell Data Science Foundations 2023
- Certification Provider: DELL EMC
- Latest update: Nov 19,2024
In a decision tree, what is an example of a pure node?
- A . 25 positives; 75 negatives
- B . 50 positives; 50 negatives
- C . 75 positives; 25 negatives
- D . 100 positives; 0 negatives
When would you prefer a Naive Bayes model to a logistic regression model for classification?
- A . When you are using several categorical input variables with over 1000 possible values each.
- B . When you need to estimate the probability of an outcome, not just which class it is in.
- C . When all the input variables are numerical.
- D . When some of the input variables might be correlated.
What is an appropriate assignment for a data scientist?
- A . Monitor key performance indicators
- B . Define an OLAP database schema
- C . Conduct customer surveys
- D . Develop predictive models
What is the output format from the Map function of MapReduce?
- A . Key-value pairs
- B . Binary representation of keys concatenated with structured data
- C . Compressed index
- D . Unique key record and separate records of all possible values
What does the R code z <- f[1:10, ] do?
- A . Assigns the first 10 rows of f to the vector z
- B . Assigns the 1st 10 columns of the 1st row of f to z
- C . Assigns a sequence of values from 1 to 10 to z
- D . Assigns the 1st 10 columns to z
What is a core deliverable at the end of the analytic project?
- A . An implemented database design
- B . A whitepaper describing the project and the implementation
- C . A presentation for project sponsors
- D . The training materials
Consider the following SQL statement:
SELECT employee_id, year, salary, avg(salary)
OVER
(PARTITION BY employee_id ORDER BY year ROWS BETWEEN 2 PRECEDING AND CURRENT ROW) as result_1
FROM employee
ORDER BY employee_id, year
For each employee_id, what is returned as result_1?
- A . Three year rolling average salary
- B . Four year rolling average salary
- C . Average salary across all employee_id values
- D . Average employee_id
What is the mandatory Clause that must be included when using Window functions?
- A . OVER
- B . RANK
- C . PARTITION BY
- D . RANK BY
In a fitted ARIMA(1,2,3) model, how many differences are applied?
- A . 0
- B . 1
- C . 2
- D . 3
If R factors are categorical variables, which data classification level are they most closely related?
- A . Nominal
- B . Ordinal
- C . Interval
- D . Ratio
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