Dell EMC Data Science and BigData Certification Questions and Answers

Question : You have been assigned to do a study of the daily revenue effect of a pricing model of online
transactions. When have you completed the analytics lifecycle?


1. You have a completely developed model based on both a sample of the data and the entire set
of data available.
2. You have presented the results of the model to both the internal analytics team and the
business owner of the project.
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results
4. You have written documentation, and the code has been handed off to the Data Base
Administrator and business operations.




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Explanation: Operationalize: In Phase 6, the team delivers final reports, briefings,
code, and technical documents. In addition, the team may run a pilot project to
implement the models in a production environment.






Question : Consider these itemsets:
(hat, scarf, coat)
(hat, scarf, coat, gloves)
(hat, scarf, gloves)
(hat, gloves)
(scarf, coat, gloves)
What is the confidence of the rule (gloves -> hat)?

1. 75%
2. 60%
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4. 80%

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Explanation:






Question : What is holdout data?


1. a subset of the provided data set selected at random and used to initially construct the model
2. a subset of the provided data set that is removed by the data scientist because it contains data errors
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4. a subset of the provided data set selected at random and used to validate the model


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Explanation:In Phase 4, the data science team needs to develop datasets for training, testing, and production purposes. These datasets enable the data scientist to develop the analytical model and train it
("training data"), while holding aside some of the data ("hold-out data" or "test data") for testing the model. During this process, it is critical to ensure that the training and test datasets are sufficiently
robust for the model and analytical techniques. A simple way to think of these datasets is to view the training dataset for conducting the initial experiments and the test sets for validating an approach once the
initial experiments and models have been run.

Related Questions

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Question : Which of the following statement is correct with regards to Association rules?
A. It is an unsupervised learning method
B. It is a supervised learning method
C. It is a predictive method
D. It is a nonproductive method


1. A,B
2. B,C
3. C,D
4. A,D
5. B,D


Question : Which of the following questions can be answered using the Association Rules?



1. Which all books are purchased together on a portal

2. Of those readers who are similar to this reader, what books do they tend to buy?

3. Of those readers who have purchased this book, what other similar books do they tend to buy.

4. 1,2

5. 1,2,3


Question : Which of the following statements apply Apriori algorithm?



1. It can be used to generate clustering.

2. It can be used for classification

3. It can be used to reduce the dimensionality

4. It can be used to generate association rules



Question : You have been given a huge datasets with the following occurrences
Bread is 80% of the time in all transactions, combination of bread and milk is 60% of the time in all transactions. Which of the following statement is correct with regards to Apriori?



1. Support for {bread} is 0.8

2. Support for {bread} is 0.6

3. Support for {bread} is 1.4

4. Support for {bread} is 0.2



Question : For Apriori algorithm you have decided that minimum support value is ., which of the following are frequent itemsets, if following percentage occurrences are given?
Bread->80%
Milk->70%
Bread,Milk -> 55%
Bread, Banana -> 30%
A. Bread
B. Milk
C. Bread, Milk
D. Banana
E. Bread, Banana


1. A,B,C
2. B,C,D
3. C,D,E
4. A,D,E
5. A,C,E


Question : You have been given combination of three item sets as {a,b,c} are having . support and minimum support is defined as .. So which of the following statement is correct?
A. Combination of {a,b} are frequent item sets
B. Combination of {b,c} are frequent item sets
C. Combination of {a,c} are frequent item sets
D. Item {a} is a frequent dataset
E. Item {c} is a frequent dataset


1. A,B,C
2. B,C,D
3. B,C,D,E
4. A,B,C,D
5. A,B,C,D,E