[Oct 30, 2024] D-DS-FN-23 Exam Dumps, D-DS-FN-23 Practice Test Questions
Free D-DS-FN-23 Study Guides Exam Questions and Answer
NEW QUESTION # 53
What does the R code z <- f[1:10, ] do?
- A. Assigns the 1st 10 columns to z
- B. Assigns the 1st 10 columns of the 1st row of f to z
- C. Assigns the first 10 rows of f to the vector z
- D. Assigns a sequence of values from 1 to 10 to z
Answer: C
NEW QUESTION # 54
In a user-defined aggregate function, what is SFUNC?
- A. State transition function
- B. Window function
- C. Final calculation function
- D. Segment-level calculation function
Answer: A
NEW QUESTION # 55
You have been assigned to do a study of the daily revenue effect of a pricing model of online transactions.
You have tested all the theoretical models in the previous model planning stage, and all tests have yielded statistically insignificant results.
What is your next step?
- A. Run all the models again against a larger sample, leveraging more historical data.
- B. Report that the results are insignificant, and reevaluate the original business question.
- C. Modify samples used by the models and iterate until a significant result occurs.
- D. Move forward on the model with the highest significance scores relative to the others.
Answer: B
NEW QUESTION # 56
In addition to the business question and descriptions of available data sets, what else would an analytic plan include?
- A. Existing solutions to the business question
- B. Initial hypotheses
- C. Access credentials to database and/or Hadoop cluster
- D. Relevant statistical tests
Answer: B
NEW QUESTION # 57
Which key role for a successful analytic project can provide business domain expertise with a deep understanding of the data and key performance indicators?
- A. Project Sponsor
- B. Business User
- C. Project Manager
- D. Business Intelligence Analyst
Answer: D
NEW QUESTION # 58
You have fit a decision tree classifier using 12 input variables. The resulting tree used 7 of the 12 variables, and is 5 levels deep. Some of the nodes contain only 3 data points. The AUC of the model is 0.85.
What is your evaluation of this model?
- A. The tree did not split on all the input variables. You need a larger data set to get a more accurate model.
- B. The AUC is high, so the overall model is accurate. It is not well-calibrated, because the small nodes will give poor estimates of probability.
- C. The AUC is high, and the small nodes are all very pure. This is an accurate model.
- D. The tree is probably overfit. Try fitting shallower trees and using an ensemble method.
Answer: D
NEW QUESTION # 59
A data scientist is preparing a presentation for a meeting with the project's business sponsors. The distribution of per-sale revenue is an important finding from the analysis. The graphics illustrate four ways to plot the per-sale revenue distribution.."
Which graphic is most appropriate for the sponsor presentation?
- A. Figure B
- B. Figure A
- C. Figure D
- D. Figure C
Answer: A
NEW QUESTION # 60
You have run a Linear Regression model on the data shown in the graphic.
Which value is a reasonable guess for R-squared?
- A. 1.25
- B. .8
- C. .25
- D. -.8
Answer: B
NEW QUESTION # 61
Refer to the exhibit.
You are using K-means clustering to classify customer behavior for a large retailer. You need to determine the optimum number of customer groups. You plot the within-sum-of- squares (wss) data as shown in the exhibit.
How many customer groups should you specify?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION # 62
In which lifecycle stage are appropriate analytical techniques determined?
- A. Data preparation
- B. Model planning
- C. Discovery
- D. Model building
Answer: B
NEW QUESTION # 63
The web analytics team uses Hadoop to process access logs. They now want to correlate this data with structured user data residing in a production single-instance JDBC database. They collaborate with the production team to import the data into Hadoop.
Which tool should they use?
- A. Pig
- B. Sqoop
- C. Scribe
- D. Chukwa
Answer: B
NEW QUESTION # 64
Which word or phrase completes the statement? Business Intelligence is to monitoring trends as Data Science is to ________ trends.
- A. Optimizing
- B. Predicting
- C. Driving
- D. Discarding
Answer: B
NEW QUESTION # 65
In which lifecycle stage are test and training data sets created?
- A. Data preparation
- B. Discovery
- C. Model planning
- D. Model building
Answer: D
NEW QUESTION # 66
Why do the Naïve Bayesian classifier implementations use the log of probability value rather than the pure probability value?
- A. To obtain a more accurate estimate of the probabilities without the need for a Laplace smoothing
- B. To avoid numerical underflow errors in high dimensional problems
- C. To ensure the conditional independence of attribute values
- D. To invalidate the variables that are continuous
Answer: B
NEW QUESTION # 67
Refer to the exhibit.
The graph represents an ROC space with four classifiers labelled A through D.
Which point in the graph represents a perfect classification?
- A. P
- B. R
- C. S
- D. Q
Answer: C
NEW QUESTION # 68
Which component of a final presentation focuses on how to deploy the model?
- A. Project goals
- B. Executive summary
- C. Approach
- D. Recommendations
Answer: D
NEW QUESTION # 69
You have used k-means clustering to classify behavior of 100, 000 customers for a retail store. You decide to use household income, age, gender and yearly purchase amount as measures.
You have chosen to use 8 clusters and notice that 2 clusters only have 3 customers assigned.
What should you do?
- A. Decrease the number of clusters
- B. Decrease the number of measures used
- C. Increase the number of clusters
- D. Identify additional measures to add to the analysis
Answer: A
NEW QUESTION # 70
Data visualization is used in the final presentation of an analytics project.
For what else is this technique commonly used?
- A. Model selection
- B. ETLT
- C. Descriptive statistics
- D. Assessing data quality
Answer: D
NEW QUESTION # 71
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