Pass Your D-DS-FN-23 Exam at the First Try with 100% Real Exam Questions
New EMC D-DS-FN-23 Dumps & Questions Updated on 2024
NEW QUESTION # 94
What is required in a presentation for project sponsors?
- A. Data warehouse design changes
- B. Detailed statistical basis for the modeling approach used in the project
- C. The "Big Picture" takeaways for executive level stakeholders
- D. Line by line review of the developed code
Answer: C
NEW QUESTION # 95
When creating a project sponsor presentation, what is the main objective?
- A. Show how you met the project goals
- B. Clearly describe the methods and techniques used
- C. Show how well the model will meet the SLA (service level agreement)
- D. Show that you met the project goals
Answer: D
NEW QUESTION # 96
Which participant in a data analytics project is typically responsible for assessing the validity of the model?
- A. Data scientist
- B. Business user
- C. Project sponsor
- D. Project manager
Answer: A
NEW QUESTION # 97
What describes the use of UNION clause in a SQL statement?
- A. Operates on queries and potentially decreases the number of rows
- B. Operates on queries and potentially increases the number of rows
- C. Operates on tables and potentially decreases the number of columns
- D. Operates on both tables and queries and potentially increases both the number of rows and columns
Answer: B
NEW QUESTION # 98
In data visualization, what is used to focus the audience on a key part of a chart?
- A. Emphasis colors
- B. Detailed text
- C. A data table
- D. Pastel colors
Answer: A
NEW QUESTION # 99
You are asked to create a model to predict the total number of monthly subscribers for a specific magazine. You are provided with 1 year's worth of subscription and payment data, user demographic data, and 10 years worth of content of the magazine (articles and pictures).
Which algorithm is the most appropriate for building a predictive model for subscribers?
- A. Decision trees
- B. Linear regression
- C. Logistic regression
- D. TF-IDF
Answer: B
NEW QUESTION # 100
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 AUC is high, and the small nodes are all very pure. This is an accurate model.
- B. The tree is probably overfit. Try fitting shallower trees and using an ensemble method.
- C. The tree did not split on all the input variables. You need a larger data set to get a more accurate model.
- D. 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.
Answer: B
NEW QUESTION # 101
How does an HBase data structure differ from an ANSI standard relational database management system (RDBMS)?
- A. HBase supports a single table with no implicit join ability to other tables; ANSI standard RDBMS supports multiple tables with join ability
- B. HBase has strongly defined data columns;
ANSI standard RDBMS is more flexible with column definitions - C. HBase is challenged by sparse data;
ANSI standard RDBMS handles missing values well by using null fields - D. HBase provides a wider variety of predefined data types for data;
ANSI standard RDBMS provides less variety
Answer: A
NEW QUESTION # 102
Which two tools support query languages that can be used with Hadoop?
- A. Pig and Howl
- B. Hive and Hbase
- C. Hbase and Howl
- D. Hive and Pig
Answer: D
NEW QUESTION # 103
What is LOESS used for?
- A. It is a significance test for the correlation between two variables.
- B. It fits a smoothed curve to scatterplot data, to give a general sense of the data's behavior.
- C. It plots a continuous variable versus a discrete variable, to compare distributions across classes.
- D. It is run after a one-way ANOVA, to determine which population has the highest mean value.
Answer: B
NEW QUESTION # 104
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 = 262/15 FNR = 288/26
- B. FPR = 288/26 FNR = 262/15
- C. FPR = 15/262 FNR = 26/288
- D. FPR = 26/288 FNR = 15/262
Answer: C
NEW QUESTION # 105
You submit a MapReduce job to a Hadoop cluster and notice that although the job was successfully submitted, it is not completing.
What should you do?
- A. Ensure that the JobTracker is running
- B. Ensure that the NameNode is running
- C. Ensure that a DataNode is running
- D. Ensure that the TaskTracker is running.
Answer: D
NEW QUESTION # 106
Which key role for a successful analytic project can consult and advise the project team on the value of end results and how these will be used on a day-to-day basis?
- A. Project Manager
- B. Business User
- C. Data Scientist
- D. Business Intelligence Analyst
Answer: B
NEW QUESTION # 107
In a user-defined aggregate function, what is SFUNC?
- A. Window function
- B. State transition function
- C. Final calculation function
- D. Segment-level calculation function
Answer: B
NEW QUESTION # 108
You are testing two new weight-gain formulas for puppies. The test gives the results: Control group: 1% weight gain Formula A. 3% weight gain Formula B. 4% weight gain A one-way ANOVA returns a p-value = 0.027
What can you conclude?
- A. Formula B is more effective at promoting weight gain than Formula A.
- B. Formula A and Formula B are about equally effective at promoting weight gain.
- C. Formula A and Formula B are both effective at promoting weight gain.
- D. Either Formula A or Formula B is effective at promoting weight gain.
Answer: D
NEW QUESTION # 109
What activities occur during the discovery phase of the data analytics lifecycle?
- A. Interview project sponsor and stakeholders
- B. Build training and test datasets
- C. Perform ETL and data exploration
- D. Deploy and monitor model performance
Answer: A
NEW QUESTION # 110
Which word or phrase completes the statement? Data-ink ratio is to data visualization as _________.
- A. Data scientist is to big data
- B. Confusion matrix is to classifier
- C. Seasonality is to ARIMA
- D. K-means is to Naive Bayes
Answer: B
NEW QUESTION # 111
What are categorized as data ingestion tools for Hadoop?
- A. Flume, Sqoop, and Storm
- B. Drill, Hive, and HBase
- C. Ambari, Oozie, and Zookeeper
- D. Spark, Tez, and Cassandra
Answer: A
NEW QUESTION # 112
Consider this SQL statement:
SELECT product, prod_cost, avg(prod_cost) OVER (PARTITION BY product)
FROM product_detail
The OVER clause makes this what type of function?
- A. Aggregate function
- B. User-defined function
- C. Window function
- D. System function
Answer: C
NEW QUESTION # 113
Under which circumstance do you need to implement N-fold cross-validation after creating a regression model?
- A. There is not enough data to create a test set.
- B. The data is unformatted.
- C. There are categorical variables in the model.
- D. There are missing values in the data.
Answer: A
NEW QUESTION # 114
You have been assigned to run a linear regression model for each of 5, 000 distinct districts, and all the data is currently stored in a PostgreSQL database.
Which tool/library would you use to produce these models with the least effort?
- A. MADlib
- B. HBase
- C. Mahout
- D. R
Answer: A
NEW QUESTION # 115
You are analyzing data in order to build a classifier model. You discover non-linear data and discontinuities that will affect the model.
Which analytical method would you recommend?
- A. Logistic Regression
- B. Decision Trees
- C. ARIMA
- D. Linear Regression
Answer: B
NEW QUESTION # 116
You have completed your model and are handing it off to be deployed in production.
What should you deliver to the production team, along with your commented code?
- A. The production team needs to understand how your model will interact with the processes they already support. Give them documentation on expected model inputs and outputs, and guidance on error-handling.
- B. The production team supports the processes that run the organization, and they need context to understand how your model interacts with the processes they already support. Give them the same presentation that you prepared for the project sponsor.
- C. The production team supports the processes that run the organization, and they need context to understand how your model interacts with the processes they already support. Give them the executive summary.
- D. The production team are technical, and they need to understand how the processes that they support work, so give them the same presentation that you prepared for the analysts.
Answer: A
NEW QUESTION # 117
Which word or phrase completes the statement; "Adata scientist would consider a RDBMS is to a table as R is to a_____."?
- A. Matrix
- B. Data frame
- C. Array
- D. List
Answer: B
NEW QUESTION # 118
You have been assigned to perform a study of the daily revenue effect of a pricing model of online transactions. All data currently available to you has been loaded into your analytics database. This includes revenue data, pricing data, and online transaction data.
You discover that all data comes in different levels of granularity. The transaction data has timestamps consisting of day, hour, minutes, and seconds. Pricing is stored at the daily level and revenue data is only reported monthly.
What is the next step?
- A. Interpolate a daily model for revenue from the monthly revenue data.
- B. Disregard revenue as the key reason in the pricing model and create a daily model based on pricing and transactions only.
- C. Aggregate all data to the monthly level in order to create a monthly revenue model.
- D. Report back to the business owner that the current data model does not support the business question.
Answer: D
NEW QUESTION # 119
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