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

出題：1

Which SQL set operator returns rows that exist in the first SELECT statement answer set but not in the second SELECT statement?

A. UNION ALL

B. EXCEPT

C. INTERSECT

D. UNION

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：2

Refer to the exhibit

Consider the training data set shown in the exhibit.
What are the classification (Y = 0 or 1) and the probability of the classification for the tupleX(0, 0, 1) using Naive Bayesian classifier?

A. Classification Y = 1, Probability = 4/54

B. Classification Y = 0, Probability = 1/54

C. Classification Y = 1, Probability = 1/54

D. Classification Y = 0, Probability = 4/54

正解：A 解答を投票する

出題：3

What are the characteristics of Big Data?

A. Data volume, processing complexity, and business importance.

B. Data volume, business importance, and data structure variety.

C. Data type, processing complexity, and data structure variety.

D. Data volume, processing complexity, and data structure variety.

正解：D 解答を投票する

出題：4

What are the two data categories that represent qualitative data?

A. Ratio and interval

B. Ordinal and interval

C. Nominal and ordinal

D. Nominal and ratio

正解：C 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：5

A data scientist plans to classify the sentiment polarity of 10, 000 product reviews collected from the Internet.
What is the most appropriate model to use? Suppose labeled training data is available.

A. K-means clustering

B. Naïve Bayesian classifier

C. Linear regression

D. Logistic regression

正解：B 解答を投票する

出題：6

When would you prefer a Naive Bayes model to a logistic regression model for classification?

A. When you need to estimate the probability of an outcome, not just which class it is in.

B. When all the input variables are numerical.

C. When you are using several categorical input variables with over 1000 possible values each.

D. When some of the input variables might be correlated.

正解：C 解答を投票する

出題：7

Refer to the Exhibit.

You are working on creating an OLAP query that outputs several rows of with summary rows of subtotals and grand totals in addition to regular rows that may contain NULL as shown in the exhibit.
Which function can you use in your query to distinguish the row from a regular row to a subtotal row?

A. ROLLUP

B. GROUP_ID

C. RANK

D. GROUPING

正解：D 解答を投票する

出題：8

What requests resources from YARN during a MapReduce job?

A. Map and reduce tasks

B. DataNodes

C. ApplicationMaster

D. ApplicationsManager

正解：C 解答を投票する

出題：9

What is a core deliverable at the end of the analytic project?

A. A whitepaper describing the project and the implementation

B. An implemented database design

C. A presentation for project sponsors

D. The training materials

正解：C 解答を投票する

出題：10

After running a density plot you realize that the data has a long tail to the right. What can you do to make the dataset more normally distributed?

A. Use a histogram to obtain a better picture

B. Apply a logarithmic transformation

C. Use a scatter plot to obtain a better picture

D. Apply a square transformation

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：11

Which data asset is an example of unstructured data?

A. Webserver log

B. News article text

C. XML data file

D. Database table

正解：B 解答を投票する

出題：12

You are using a Logistic Regression model to determine if an applicant's gender is a factor in determining whether or not they receive a bank loan. When you plot the results, you notice that the regression coefficient is zero.
What can be determined?

A. Sample size of the data is too small

B. Sample size of the data is too large

C. Applicant's gender does not influence the loan decision

D. Applicant's gender influences the loan decision

正解：C 解答を投票する

出題：13

What is a property of window functions in SQL commands?

A. They can be used to calculate moving averages over various intervals.

B. They can be used between the keywords FROM and WHERE in a SELECT command.

C. They don't require ordering of data within a window.

D. They group rows into a single output row.

正解：A 解答を投票する

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