DEA-7TT2 Exam Training Practice Tests (EMC Associate - Data Science and Big Data Analytics v2)]

Question 1

In addition to less data movement and the ability to use larger datasets in calculations, what is a benefit of analytical calculations in a database?
Response:

A. full use of data aggregation functionality B. quicker time to insight C. more efficient handling of categorical values D. improved connections between disparate data sources

Correct Answer: B

Question 2

Your organization has a website where visitors randomly receive one of two coupons. It is also possible that visitors to the website will not receive a coupon.
You have been asked to determine if offering a coupon to visitors to your website has any impact on their purchase decision. Which analysis method should you use?
Response:

A. Student T-test B. Association rules C. K-means clustering D. One-way ANOVA

Correct Answer: D

Question 3

You have used k-means clustering to classify behavior of 100, 000 customers for a retail store. You decide to use household income, age, gender and yearly purchase amount as measures. You have chosen to use 8 clusters and notice that 2 clusters only have 3 customers assigned.
What should you do?
Response:

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

Correct Answer: B

Question 4

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

Correct Answer: C

Question 5

Assume that you have a data frame in R. Which function would you use to display descriptive statistics about this variable?
Response:

A. str B. attributes C. summary D. levels

Correct Answer: C

Question 6

What is an appropriate data visualization to use in a presentation to a project sponsor?
Response:

A. Box and Whisker Plot B. Bar Chart C. Density Plot D. Pie Chart

Correct Answer: B

Question 7

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. Association rules C. Naive Bayes classifier D. K-means clustering

Correct Answer: D

Question 8

In naive Bayes implementations, how is the possibility of zero probabilities resulting from unobserved attribute/classifier pairs properly handled?
Response:

A. Add a large quantity to each of the observed counts B. Add a small quantity to each of the observed counts C. Double the observed counts D. Square the observed counts

Correct Answer: B

Question 9

Which activity is performed in the Operationalize phase of the data analytics lifecycle?
Response:

A. Assess the benefits B. Try different variables C. Transform existing variables D. Try different analytical techniques

Correct Answer: A

Question 10

In time series analysis, what function is examined to identify the order of the moving average component of an ARIMA model?
Response:

A. Exponential function B. Arithmetic mean function C. Autocorrelation function D. Geometric mean function

Correct Answer: C

Question 11

Under which circumstance do you need to implement N-fold cross-validation after creating a regression model?
Response:

A. There is not enough data to create a test set. B. There are categorical variables in the model. C. There are missing values in the data. D. The data is unformatted.

Correct Answer: A

Question 12

Which component of a final presentation focuses on how to deploy the model?
Response:

A. Recommendations B. Project goals C. Approach D. Executive summary

Correct Answer: A

Question 13

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

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

Correct Answer: C

Question 14

Refer to the exhibit.

What is the approximate R-squared value for a linear regression model fitted to the data associated with this scatterplot?
Response:

A. 4 B. 0.01 C. 0.96 D. 16

Correct Answer: B

Question 15

Your colleague, who is new to Hadoop, approaches you with a question. They want to know how best to access their dat a. This colleague has a strong background in data flow languages and programming.
Which query interface would you recommend?
Response:

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

Correct Answer: C

EMC Associate - Data Science and Big Data Analytics v2 - DEA-7TT2 Exam Practice Test