[2025年05月最新リリース]DEA-7TT2試験問題はあなたをパスさせる [Q128-Q143]

[2025年05月最新リリース]DEA-7TT2試験問題はあなたをパスさせる

EMC DEA-7TT2試験基本問題とアンサー

質問 # 128
In which lifecycle stage are initial hypotheses formed?
Response:

A. Model planning
B. Discovery
C. Model building
D. Data preparation

正解：B

質問 # 129
What is the output format from the Map function of MapReduce?
Response:

A. Binary representation of keys concatenated with structured data
B. Compressed index
C. Unique key record and separate records of all possible values
D. Key-value pairs

正解：D

質問 # 130
Consider a database with 4 transactions:
Transaction 1: {cheese, bread, milk}
Transaction 2: {soda, bread, milk}
Transaction 3: {cheese, bread}
Transaction 4: {cheese, soda, juice}
You decide to run the association rules algorithm where minimum support is 50%. Which rule has a confidence at least 50%?
Response:

A. {juice} => {cheese}
B. {milk} => {soda}
C. {cheese} => {bread}
D. {soda} => {milk}

正解：C

質問 # 131
Refer to the exhibit.

You are asked to write a report on how specific variables impact your client's sales using a data set provided to you by the client. The data includes 15 variables that the client views as directly related to sales, and you are restricted to these variables only.
After a preliminary analysis of the data, the following findings were made:
1. Multicollinearity is not an issue among the variables
2. Only three variables-A, B, and C-have significant correlation with sales You build a linear regression model on the dependent variable of sales with the independent variables of A, B, and C. The results of the regression are seen in the exhibit.
Which interpretation is supported by the analysis?
Response:

A. Due to the R2 of 0.10, the model is not valid - the linear regression should be rerun with all 15 variables forced into the model to increase the R2
B. Due to the R2 of 0.10, the model is not valid - a different analytical model should be attempted
C. Variables A, B, and C are significantly impacting sales, but are not effectively estimating sales
D. Variables A, B, and C are significantly impacting sales and are effectively estimating sales

正解：C

質問 # 132
Refer to the exhibit.

You have created a density plot of purchase amounts from a retail website as shown. What should you do next?
Response:

A. Recreate the plot using the barplot() function
B. Recreate the density plot using a log normal distribution of the purchase amount data
C. Reduce the sample size of the purchase amount data used to create the plot
D. Use the rug() function to add elements to the plot

正解：B

質問 # 133

You have created a scatter plot using R from household income and education data as shown in the graphic. What can be done to improve the visualization?
Response:

A. Recreate the plot with a Bar plot
B. Recreate the plot with a hexbin plot
C. Add a Box and Whisker overlay to the plot
D. Add a rug to the plot

正解：B

質問 # 134
You are analyzing a time series and want to determine its stationarity. You also want to determine the order of autoregressive models. How are the autocorrelation functions used?
Response:

A. ACF as an indication of stationarity, and PACF for the correlation between Xt and Xt-k not explained by their mutual correlation with X1 through Xk-1.
B. ACF as an indication of stationarity, and PACF to determine the correlation of X1 through Xk-1.
C. PACF as an indication of stationarity, and ACF for the correlation between Xt and Xt-k not explained by their mutual correlation with X1 through Xk-1.
D. PACF as an indication of stationarity, and ACF to determine the correlation of X1 through Xk-1.

正解：A

質問 # 135
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 larger sample size should be taken to determine if the plant is operating correctly
B. A smaller sample size should be taken to determine if the plant is operating correctly
C. The manufacturing process is functioning properly and no further action is required
D. There is a flaw in the quality assurance process and the sample should be repeated

正解：C

質問 # 136
What should be subtracted to remove a simple linear trend from a time series?
Response:

A. Cubic-spline
B. Expected absolute deviation
C. Expected squared deviation
D. Least-squares-fit line

正解：D

質問 # 137
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 dat a.
How should you proceed?
Response:

A. Divide the data into sets of 1, 000 user profiles, and run K-means clustering in RHadoop iteratively.
B. Run a Naive Bayes classification as a pre-processing step in HDFS.
C. Partition the data by XML file size, and run K-means clustering in each partition.
D. Run MapReduce to transform the data, and find relevant key value pairs.

正解：D

質問 # 138
In data visualization, which type of chart is recommended to represent frequency data?
Response:

A. Histogram
B. Line chart
C. Scatterplot
D. Q-Q chart

正解：A

質問 # 139
What are challenges presented by Big Data?
Response:

A. New technologies, tools, business processes, and regulatory rules
B. New technologies, tools, and business processes only
C. New technologies, tools and regulatory rules only
D. New technologies, and tools only

正解：A

質問 # 140
Which word or phrase completes the statement? Data-ink ratio is to data visualization as _________.
Response:

A. Data scientist is to big data
B. Confusion matrix is to classifier
C. Seasonality is to ARIMA
D. K-means is to Naive Bayes

正解：B

質問 # 141
What provides the means for matching and manipulating text strings in SQL?
Response:

A. Association rules
B. Regular expressions
C. TF-IDF
D. PACF

正解：B

質問 # 142
Which word or phrase completes the statement; "The intersection of two sets is to INNER JOIN as the union of two sets is to __________."?
Response: