DEA-7TT2無料問題集「EMC Associate - Data Science and Big Data Analytics v2」

質問 1

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?
Response:

（A）(hat, scarf), (hat, gloves)

（B）(scarf, gloves), (scarf, coat) (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

質問 2

A call center for a large electronics company handles an average of 35, 000 support calls a day. The head of the call center would like to optimize the staffing of the call center during the rollout of a new product due to recent customer complaints of long wait times.
You have been asked to create a model to optimize call center costs and customer wait times. The goals for this project include:
1. Relative to the release of a product, how does the call volume change over time?
2. How to best optimize staffing based on the call volume for the newly released product, relative to old products.
3. Historically, what time of day does the call center need to be most heavily staffed?
4. Determine the frequency of calls by both product type and customer language.
Which goals are suitable to be completed with MapReduce?
Response:

（A）Goal 1 and 3

（B）Goals 1, 2, 3, 4

（C）Goals 2, 3, 4

（D）Goal 2 and 4

正解：D 解答を投票する

質問 3

You have run a Linear Regression model on the data shown in the graphic. Which value is a reasonable guess for R-squared?
Response:

（A）-.8

（B）1.25

（C）.25

（D）.8

正解：D 解答を投票する

質問 4

Which term is used to describe separating a database into separate parts that can be processed in parallel?
Response:

（A）Reconstituting

（B）Deduplication

（C）Sharding

（D）Replication

正解：C 解答を投票する

質問 5

After which phase of the data analytics lifecycle should you determine if the model is robust enough?
Response:

（A）Operationalize

（B）Model building

（C）Discovery

（D）Data preparation

正解：B 解答を投票する

質問 6

What is Hadoop?
Response:

（A）Map Reduce paradigm and HDFS

（B）Java classes for HDFS types and Map Reduce job management and the Map Reduce paradigm

（C）Map Reduce paradigm and massive unstructured data storage on commodity hardware

（D）Java classes for HDFS types and Map Reduce job management and HDFS

正解：D 解答を投票する

質問 7

Which characteristic applies mainly to Data Science as opposed to Business Intelligence?
Response:

（A）Focus on structured data

（B）Advanced analytical methods

（C）Data dashboards

（D）Robust reporting

正解：B 解答を投票する

質問 8

Which word or phrase completes the statement? A spreadsheet is to a data island as a centralized database for reporting is to a __________?
Response:

（A）Analytic Sandbox

（B）Data Warehouse

（C）Data Repository

（D）Data Mart

正解：B 解答を投票する

質問 9

Refer to the exhibit.

After analyzing a dataset, you report findings to your team:
1. Variables A and C are significantly and positively impacting the dependent variable.
2. Variable B is significantly and negatively impacting the dependent variable.
3. Variable D is not significantly impacting the dependent variable.
After seeing your findings, the majority of your team agreed that variable B should be positively impacting the dependent variable.
What is a possible reason the coefficient for variable B was negative and not positive?
Response:

（A）Variable B needs a logarithmic transformation due to its relationship to the dependent variable

（B）The information gain from variable B is already provided by another variable

（C）Variable B needs a quadratic transformation due to its relationship to the dependent variable

（D）Variable B is interacting with another variable due to correlated inputs

正解：D 解答を投票する

質問 10

You are provided four different datasets. Initial analysis on these datasets show that they have identical mean, variance and correlation values. What should your next step in the analysis be?
Response:

（A）Select one of the four datasets and begin planning and building a model

（B）Visualize the data to further explore the characteristics of each data set

（C）Recalculate the descriptive statistics since they are unlikely to be identical for each dataset

（D）Combine the data from all four of the datasets and begin planning and bulding a model

正解：B 解答を投票する

質問 11

In data visualization, which type of chart is recommended to represent frequency data?
Response:

（A）Q-Q chart

（B）Histogram

（C）Line chart

（D）Scatterplot

正解：B 解答を投票する

質問 12

Which Hadoop service is responsible for requesting resources for, and monitoring the completion of, MapReduce processes?
Response:

（A）Application Master

（B）Application Manager

（C）DataNode

（D）NameNode

正解：A 解答を投票する

質問 13

Which word or phrase completes the statement; "Discovering relationships is to Association Rules as generating forecasts is to __________."?
Response:

（A）Time Series Analysis

（B）Text Analysis

（C）Classification

（D）Clustering

正解：A 解答を投票する

質問 14

How are window functions different from regular aggregate functions?
Response:

（A）Rows retain their separate identities and the window function can access more than the current row.

（B）Rows are grouped into an output row and the window function can access more than the current row.

（C）Rows retain their separate identities and the window function can only access the current row.

（D）Rows are grouped into an output row and the window function can only access the current row.

正解：A 解答を投票する

質問 15

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?
Response:

（A）You have presented the results of the model to both the internal analytics team and the business owner of the project.

（B）You have a completely developed model, and the results have shown statistically acceptable results.

（C）You have written documentation, and the code has been handed off to the Data Base Administrator and business operations.

（D）You have a completely developed model based on both a sample of the data and the entire set of data available.

正解：C 解答を投票する

質問 16

You do a Student's t-test to compare the average test scores of sample groups from populations A and B. Group A averaged 10 points higher than group B. You find that this difference is significant, with a p-value of 0.03.
What does that mean?
Response:

（A）There is a 3% chance that a sample group from population A will score 10 points higher that a sample group from population B.

（B）The difference in scores between a sample from population A and a sample from population B will tend to be within 3% of 10 points.

（C）There is a 97% chance that a sample group from population A will score 10 points higher that a sample group from population B.

（D）There is a 3% chance that you have identified a difference between the populations when in reality there is none.

正解：D 解答を投票する

質問 17

When is a Wilcoxon Rank-Sum test used?
Response:

（A）When the populations represent the sums of other values

（B）When an assumption about the distribution of the populations cannot be made

（C）When the data can be easily sorted

（D）When the data cannot be easily sorted

正解：B 解答を投票する

質問 18

Which word or phrase completes the statement; "Excessive emphasis color is to Bar chart as __________________."?
Response:

（A）Multicollinearity is to OLS

（B）Multicollinearity is to serial correlation

（C）Confidence interval is to regression

（D）Confidence is to leverage

正解：A 解答を投票する

DEA-7TT2 無料問題集「EMC Associate - Data Science and Big Data Analytics v2」

弊社を連絡する

関連リンク

トップ試験