D-DS-FN-23試験無料問題集（358題）「EMC Dell Data Science Foundations 認定」

出題：1

What are challenges presented by Big Data?

A. New technologies, tools, and business processes only

B. New technologies, and tools only

C. New technologies, tools, business processes, and regulatory rules

D. New technologies, tools and regulatory rules only

正解：C 解答を投票する

出題：2

Match each task to its description.

正解：

出題：3

You are given 10, 000, 000 user profile pages of an online dating site in XML files, and they are stored in HDFS. You are assigned to divide the users into groups based on the content of their profiles.
You have been instructed to try K-means clustering on this data. How should you proceed?

A. Run MapReduce to transform the data, and find relevant key value pairs.

B. Partition the data by XML file size, and run K-means clustering in each partition.

C. Divide the data into sets of 1, 000 user profiles, and run K-means clustering in RHadoop iteratively.

D. Run a Naive Bayes classification as a pre-processing step in HDFS.

正解：A 解答を投票する

出題：4

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)?

A. 66%

B. 80%

C. 75%

D. 60%

正解：C 解答を投票する

出題：5

When building a K-means clustering model, you notice that the clusters did not segment on variables that you expected. What should you do?

A. Decrease the value of K

B. Check that the data was properly scaled

C. Add the WSS to each variable

D. Multiply each variable by its standard deviation

正解：B 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：6

You have been assigned to perform a study of the daily revenue effect of a pricing model of online transactions. All the data currently available has been loaded into an analytics database.
This data includes revenue data, pricing data, and online transaction data. You have completed a thorough univariate analysis of all data and have decided that there are three different models you want to test.
Preliminary results show that all models have equally effective results.
What is the next step?

A. Prioritize models by complexity and feasibility, and proceed with the most feasible

B. Develop all three models and perform model selection in the next step of the process

C. Identify which model the business owner wants and proceed with that model

D. Select the model that demonstrates the most sophisticated technique and accuracy

正解：A 解答を投票する

出題：7

What does a leaf node represent in a decision tree?

A. Decision point on a variable

B. Outcome of a test on a variable

C. Root of the decision tree

D. Assigned class label

正解：D 解答を投票する

出題：8

After which phase of the data analytics lifecycle should you determine if the model needs any recalibration?

A. Operationalize

B. Data preparation

C. Model planning

D. Discovery

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：9

A Data Scientist is assigned to build a model from a reporting data warehouse. The warehouse contains data collected from many sources and transformed through a complex, multi-stage ETL process.
What is a concern the data scientist should have about the data?

A. It is not normalized

B. It is not structured

C. It is too processed

D. It is too centralized

正解：C 解答を投票する

出題：10

Consider the following itemsets:
(hat, scarf, coat)
(hat, scarf, coat, gloves)
(hat, scarf, gloves)
(hat, gloves)
(scarf, coat, gloves)
If the minimum support is 50%, what represents the complete list of frequent 2-itemsets?

A. (scarf, gloves), (scarf, coat) (hat, gloves)

B. (hat, scarf), (hat, gloves)

C. (hat, scarf), (hat, gloves), (scarf, gloves), (scarf, coat)

D. (hat, scarf), (scarf, coat), (coat, gloves)

正解：C 解答を投票する

出題：11

A study was run to identify general dietary patterns among the residents of a small town. Twelve thousand people were surveyed and the data was subject to K-means clustering.
In one of the iterations, there were six clusters formed with 38, 1560, 1799, 2560, 2893, and 3150 respondents.
What should be the next step in identifying optimal clusters?

A. Add more categorical variables to the dataset to maximize the Within Sum of Squares (WSS) value for K=6

B. Remove 38 respondents because the 5 clusters seem to be well distributed

C. Multiply each variable by its standard deviation

D. Determine the optimal number of clusters by plotting the Within Sum of Squares (WSS) values as a function of K

正解：D 解答を投票する

出題：12

What is one modeling or descriptive statistical function in MADlib that is typically not provided in a standard relational database?

A. Expected value

B. Linear regression

C. Variance

D. Quantiles

正解：B 解答を投票する

出題：13

Consider the following text:
"Stop!" he shouted. "Don't go there!"
What set of words result from using a tokenizer for punctuation on the text?

A. Stop, he, shouted, dpnt. go. there

B. Stop, he, shouted, don. t. go. there

C. Stop, he shouted, don. t go there

D. Stop, he shouted, dpnt go there

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

D-DS-FN-23試験無料問題集「EMC Dell Data Science Foundations 認定」