無料セールまもなく終了！100%有効DEA-7TT2試験問題集に233問題と解答が待ってます [Q56-Q74]

無料セールまもなく終了！100%有効DEA-7TT2試験問題集に233問題と解答が待ってます

検証済みDEA-7TT2問題集と解答であなたを合格確定させるDell EMC Certification試験解答！

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質問 # 56
You have an automotive database containing numeric characteristics such as engine size, horsepower, and top speed. Which technique could you use to group similar cars together?
Response:

A. Logistic regression
B. K-means clustering
C. Naive Bayes classifier
D. Association rules

正解：B

質問 # 57
Which word or phrase completes the statement; "A theater actor is to 'artistic and expressive' as a data scientist is to."?
Response:

A. Communicative and collaborative
B. Logical and steadfast
C. Introverted and technical
D. Independent and intelligent

正解：A

質問 # 58
If your intention is to show trends over time, which chart type is the most appropriate way to depict the data?
Response:

A. Line chart
B. Bar chart
C. Histogram
D. Stacked bar chart

正解：A

質問 # 59
In which phase of the data analytics lifecycle do Data Scientists spend the most time in a project?
Response:

A. Model Building
B. Communicate Results
C. Discovery
D. Data Preparation

正解：D

質問 # 60
Which word or phrase completes the statement? Theater actor is to "Artistic and Expressive" as Data Scientist is to __________ Response:

A. "Communicative and Collaborative"
B. "Introverted and Technical"
C. "Logical and Steadfast"
D. "Independent and Intelligent"

正解：A

質問 # 61
You have been assigned to perform a study of the daily revenue effect of a pricing model of online transactions. When is the analytics lifecycle considered completed?
Response:

A. When a model has been completely developed and the results have shown statistically acceptable results.
B. When a model has been completely developed based on both a sample of the data and the entire set of data available.
C. When written documentation has been produced and the code has been handed off to the DBA/operations.
D. When the results of the model have been presented to both the internal analytics team and the business owner of the project.

正解：C

質問 # 62
What provides an extensive library of algorithm building tools to be used with the Hadoop ecosystem?
Response:

A. Pig
B. Mahout
C. Hive
D. HBase

正解：B

質問 # 63
Which word or phrase completes the statement; "A data scientist would consider a RDBMS is to a table as R is to a_____."?
Response:

A. Matrix
B. List
C. Data frame
D. Array

正解：C

質問 # 64
A disk drive manufacturer has a defect rate of less than 1.5% with 98% confidence. A quality assurance team samples 1000 disk drives and finds 14 defective units. Which action should the team recommend?
Response:

A. A smaller sample size should be taken to determine if the plant is operating correctly
B. A larger sample size should be taken to determine if the plant is operating correctly
C. There is a flaw in the quality assurance process and the sample should be repeated
D. The manufacturing process is functioning properly and no further action is required

正解：D

質問 # 65
You are assigned the task of creating customer profiles for your company. In your database, you have 25 key input variables that come together to define 2,500 customers. You decide to run a K-means cluster analysis on the 25 input variables based on k=4 to build your profiles.
Your analysis resulted in four cluster populations:
Cluster A=1,000 customers
Cluster B=560 customers
Cluster C=925 customers
Cluster D=15 customers
What should be attempted first to more evenly distribute the customer population across clusters?
Response:

A. Reduce K from 4 to 3
B. Increase K from 4 to 5
C. Remove some of the input variables from the analysis
D. Remove the 15 customers in Cluster D from the population

正解：A

質問 # 66
You are performing a market basket analysis using the Apriori algorithm. Which measure is a ratio describing the how many more times two items are present together than would be expected if those two items are statistically independent?
Response:

A. Lift
B. Confidence
C. Support
D. Leverage

正解：A

質問 # 67
What are considerations in a data science and Big Data analytics project?
Response:

A. Applying the latest technologies to demonstrate technical skills
B. Ignoring executive stakeholders and business users
C. Building data silos and bypassing data privacy rules
D. Analysis flexibility and decision making

正解：D

質問 # 68
What is a property of window functions in SQL commands?
Response:

A. They can be used between the keywords FROM and WHERE in a SELECT command.
B. They group rows into a single output row.
C. They can be used to calculate moving averages over various intervals.
D. They don,t require ordering of data within a window.

正解：C

質問 # 69
In a t-test with unknown variance, what values are used to calculate the t-statistic?
Response:

A. Sample mean, sample standard deviation, and sample size
B. Mean, sample standard deviation, and population size
C. Sample mean, standard deviation, and sample size
D. Mean, standard deviation, and population size

正解：A

質問 # 70
Your company has 3 different sales teams. Each team's sales manager has developed incentive offers to increase the size of each sales transaction.
Any sales manager whose incentive program can be shown to increase the size of the average sales transaction will receive a bonus. Data are available for the number and average sale amount for transactions offering one of the incentives as well as transactions offering no incentive.
The VP of Sales has asked you to determine analytically if any of the incentive programs has resulted in a demonstrable increase in the average sale amount.
Which analytical technique would be appropriate in this situation?
Response:

A. Student,s t-test
B. One-way ANOVA
C. Wilcox son Rank Sum Test
D. Multi-way ANOVA

正解：B

質問 # 71
You are using k-means clustering to classify heart patients for a hospital. You have chosen Patient Sex, Height, Weight, Age and Income as measures and have used 3 clusters.
When you create a pair-wise plot of the clusters, you notice that there is significant overlap between the clusters. What should you do?
Response:

A. Increase the number of clusters
B. Decrease the number of clusters
C. Identify additional measures to add to the analysis
D. Remove one of the measures

正解：B

質問 # 72
What is Hadoop?
Response:

A. Map Reduce paradigm and massive unstructured data storage on commodity hardware
B. Map Reduce paradigm and HDFS
C. Java classes for HDFS types and Map Reduce job management and the Map Reduce paradigm
D. Java classes for HDFS types and Map Reduce job management and HDFS

正解：D

質問 # 73
A time series of monthly sales indicates a periodic pattern, and the value reaches the peak every December. Which statistic needs to be subtracted from the actual value to adjust for this seasonal effect?
Response: