Latest Nov-2025 EMC D-DS-FN-23 Dumps Updated 358 Questions
PDF Download Free of D-DS-FN-23 Valid Practice Test Questions
NEW QUESTION # 36
Assume that you have a data frame in R.
Which function would you use to display descriptive statistics about this variable?
- A. levels
- B. str
- C. attributes
- D. summary
Answer: D
NEW QUESTION # 37
What are categorized as data ingestion tools for Hadoop?
- A. Spark, Tez, and Cassandra
- B. Drill, Hive, and HBase
- C. Flume, Sqoop, and Storm
- D. Ambari, Oozie, and Zookeeper
Answer: C
NEW QUESTION # 38
For which class of problem is Map Reduce most suitable?
- A. Embarrassingly parallel
- B. Minimal result data
- C. Non-overlapping queries
- D. Simple marginalization tasks
Answer: A
NEW QUESTION # 39
How does an HBase data structure differ from an ANSI standard relational database management system (RDBMS)?
- A. HBase is challenged by sparse data;
ANSI standard RDBMS handles missing values well by using null fields - B. HBase has strongly defined data columns;
ANSI standard RDBMS is more flexible with column definitions - C. HBase provides a wider variety of predefined data types for data;
ANSI standard RDBMS provides less variety - D. HBase supports a single table with no implicit join ability to other tables; ANSI standard RDBMS supports multiple tables with join ability
Answer: D
NEW QUESTION # 40
On analyzing your time series data you suspect that the data represented as y1, y2, y3, ... , yn-1, yn may have a trend component that is quadratic in nature.
Which pattern of data will indicate that the trend in the time series data is quadratic in nature?
- A. (y3-y2) - (y2-y1) = .........= (yn-yn-1)-(yn-1-yn-2)
- B. (y2-y1) = (y3-y2) = ....... = (yn-yn-1)
- C. ((y2-y1) /y1 ) * 100% = .......((yn-yn-1)/yn-1) * 100%
- D. (y4-y2) - (y3-y1) = .........= (yn-yn-2)-(yn-1-yn-3)
Answer: A
NEW QUESTION # 41
What is a core deliverable at the end of the analytic project?
- A. The training materials
- B. A whitepaper describing the project and the implementation
- C. An implemented database design
- D. A presentation for project sponsors
Answer: D
NEW QUESTION # 42
You are performing a market basket analysis using the Apriori algorithm.
Which measure is a ratio describing the how many more times two items are present together than would be expected if those two items are statistically independent?
- A. Lift
- B. Leverage
- C. Support
- D. Confidence
Answer: A
NEW QUESTION # 43
Which component of a final presentation focuses on how to deploy the model?
- A. Executive summary
- B. Approach
- C. Project goals
- D. Recommendations
Answer: D
NEW QUESTION # 44
Your customer provided you with 2, 000 unlabeled records and asked you to separate them into three groups.
What is the correct analytical method to use?
- A. K-means clustering
- B. Linear regression
- C. Logistic regression
- D. Naive Bayesian classification
Answer: A
NEW QUESTION # 45
Which word or phrase completes the statement? Business Intelligence is to ad-hoc reporting and dashboards as Data Science is to __________.
- A. Alerts and Queries
- B. Structured Data and Data Sources
- C. Optimization and Predictive Modeling
- D. Sales and profit reporting
Answer: C
NEW QUESTION # 46
In addition to less data movement and the ability to use larger datasets in calculations, what is a benefit of analytical calculations in a database?
- A. improved connections between disparate data sources
- B. more efficient handling of categorical values
- C. quicker time to insight
- D. full use of data aggregation functionality
Answer: C
NEW QUESTION # 47
You are studying the behavior of a population, and you are provided with multidimensional data at the individual level. You have identified four specific individuals who are valuable to your study, and would like to find all users who are most similar to each individual.
Which algorithm is the most appropriate for this study?
- A. Association rules
- B. K-means clustering
- C. Decision trees
- D. Linear regression
Answer: B
NEW QUESTION # 48
Refer to the exhibit.
In the exhibit, the x-axis represents the derived probability of a borrower defaulting on a loan. Also in the exhibit, the pink represents borrowers that are known to have not defaulted on their loan, and the blue represents borrowers that are known to have defaulted on their loan.
Which analytical method could produce the probabilities needed to build this exhibit?
- A. Logistic Regression
- B. Discriminant Analysis
- C. Association Rules
- D. Linear Regression
Answer: A
NEW QUESTION # 49
You are using k-means clustering to classify heart patients for a hospital. You have chosen Patient Sex, Height, Weight, Age and Income as measures and have used 3 clusters.
When you create a pair-wise plot of the clusters, you notice that there is significant overlap between the clusters.
What should you do?
- A. Remove one of the measures
- B. Increase the number of clusters
- C. Identify additional measures to add to the analysis
- D. Decrease the number of clusters
Answer: D
NEW QUESTION # 50
Which Hadoop service is responsible for requesting resources for, and monitoring the completion of, MapReduce processes?
- A. Application Manager
- B. NameNode
- C. DataNode
- D. Application Master
Answer: D
NEW QUESTION # 51
What action occurs during feature selection in the model building phase of the data analytics lifecycle?
- A. Identify the most useful input variables
- B. Select a superset of variables to shorten training times
- C. Create new combinations of attributes
- D. Overfit the model to improve prediction accuracy
Answer: A
Explanation:
Feature selection involves identifying the most useful input variables that contribute meaningfully to the model, improving accuracy and reducing complexity during the model building phase.
NEW QUESTION # 52
What is an appropriate assignment for a data scientist?
- A. Define an OLAP database schema
- B. Monitor key performance indicators
- C. Conduct customer surveys
- D. Develop predictive models
Answer: D
NEW QUESTION # 53
How should project results be communicated to executives and the project sponsor?
- A. Focus on business outcomes and benefits
- B. Emphasize coding details and technical requirements
- C. Demonstrate your technical prowess to establish credibility
- D. Provide model performance visualizations
Answer: A
Explanation:
When communicating project results to executives and the project sponsor, it's important to focus on business outcomes and benefits, ensuring they understand the value the project brings to the organization rather than the technical details.
NEW QUESTION # 54
In association rules, given X -> Y, what is confidence?
- A. Difference in the probability of X and Y appearing together compared with expectations if they were statistically independent
- B. How many times more often X and Y occur together than expected if they were statistically independent, expressed as a ratio
- C. Percentage of transactions that contain the itemset
- D. Percentage of transactions with X that also contain Y
Answer: D
NEW QUESTION # 55
You do a Student's t-test to compare the average test scores of sample groups from populations A and B.
Group Aaveraged 10 points higher than group B.
You find that this difference is significant, with a p-value of 0.03.
What does that mean?
- A. The difference in scores between a sample from population A and a sample from population B will tend to be within 3% of 10 points.
- B. There is a 3% chance that a sample group from population A will score 10 points higher that a sample group from population B.
- C. There is a 97% chance that a sample group from population A will score 10 points higher that a sample group from population B.
- D. There is a 3% chance that you have identified a difference between the populations when in reality there is none.
Answer: D
NEW QUESTION # 56
Refer to the exhibit.
Click on the calculator icon in the upper left corner. You are going into a meeting where you know your manager will have a question on your dataset -- specifically relating to customers that are classified as renters with good credit status.
In order to prepare for the meeting, you create a rule: RENTER => GOOD CREDIT.
What is the confidence of the rule?
- A. 18%
- B. 73%
- C. 41%
- D. 63%
Answer: D
NEW QUESTION # 57
Refer to the exhibit.
You have scored your Naive bayesian classifier model on a hold out test data for cross validation and determined the way the samples scored and tabulated them as shown in the exhibit.
What are the the False Positive Rate (FPR) and the False Negative Rate (FNR) of the model?
- A. FPR = 26/288 FNR = 15/262
- B. FPR = 288/26 FNR = 262/15
- C. FPR = 15/262 FNR = 26/288
- D. FPR = 262/15 FNR = 288/26
Answer: C
NEW QUESTION # 58
When would you use GROUP BY ROLLUP clause in your OLAP query?
- A. where all subtotals and grand totals are to be included in the output
- B. where only specific subtotals and grand totals for a combination of variables are to be included in the output
- C. where only the subtotals are to be included in the output
- D. where only the grand totals are to be included in the output
Answer: A
NEW QUESTION # 59
A fair six-sided die is rolled. Let A denote the event that an odd number is rolled. Let C denote the event that a 1, 2, or 3 is rolled.
What is the value of the conditional probability, P(C|A)?
- A. 2/3
- B. 1/4
- C. 1/2
- D. 1/3
Answer: A
NEW QUESTION # 60
In MADlib what does MAD stand for?
- A. Machine Learning, Algorithms for Databases
- B. Modular, Accurate, Dependable
- C. Mathematical Algorithms for Databases
- D. Magnetic, Agile, Deep
Answer: D
NEW QUESTION # 61
......
EMC D-DS-FN-23 Exam Syllabus Topics:
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
| Topic 4 |
|
D-DS-FN-23 Test Engine files, D-DS-FN-23 Dumps PDF: https://testinsides.vcedumps.com/D-DS-FN-23-examcollection.html
