EMC EMC Certifications E20-007 Questions & Answers

• Question 51:

  Which R data structure allows elements to have different data types?

  A. List

  B. Vector

  C. Matrix

  D. Array

  Correct Answer: A

• Question 52:

  Refer to the exhibit.

  

  You are using k-means clustering to discover groupings within a data set. You plot within- sum-of-squares (wss) of multiple cluster sizes. Based on the exhibit, how many clusters should you use in your analysis?

  A. 4

  B. 2

  C. 8

  D. 10

  Correct Answer: A

• Question 53:

  Which word or phrase completes the statement?

  Theater actor is to "Artistic and Expressive" as Data Scientist is to ________________

  A. "Communicative and Collaborative"

  B. "Introverted and Technical"

  C. "Logical and Steadfast"

  D. "Independent and Intelligent"

  Correct Answer: A

• Question 54:

  Since R factors are categorical variables, they are most closely related to which data classification level?

  A. nominal

  B. ordinal

  C. interval

  D. ratio

  Correct Answer: A

• Question 55:

  Imagine you are trying to hire a Data Scientist for your team. In addition to technical ability and quantitative background, which additional essential trait would you look for in people applying for this position?

  A. Communication skill

  B. Scientific background

  C. Domain expertise

  D. Well Organized

  Correct Answer: A

• Question 56:

  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?

  A. Identify additional measures to add to the analysis

  B. Remove one of the measures

  C. Decrease the number of clusters

  D. Increase the number of clusters

  Correct Answer: C

• Question 57:

  Which word or phrase completes the statement? Emphasis color is to standard color as _______ .

  A. Main message is to context

  B. Main message is to key findings

  C. Frequent item set is to item

  D. Pie chart is to proportions

  Correct Answer: A

• Question 58:

  Refer to the exhibit.

  

  You are assigned to do an end of the year sales analysis of 1, 000 different products, based on the transaction table. Which column in the end of year report requires the use of a window function?

  A. Total Sales to Date

  B. Daily Sales

  C. Average Daily Price

  D. Maximum Price

  Correct Answer: A

• Question 59:

  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?

  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. 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.

  C. ACF as an indication of stationarity, and PACF to determine the correlation of X1 through Xk-1.

  D. PACF as an indication of stationarity, and ACF to determine the correlation of X1 through Xk-1.

  Correct Answer: A

• Question 60:

  In a Student's t-test, what is the meaning of the p-value?

  A. Area under the appropriate tails of the student's distribution

  B. Power of the Student's t-test

  C. Mean of the distribution for the null hypothesis

  D. Mean of the distribution for the alternate hypothesis

  Correct Answer: A