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EMC Associate - Data Science and Big Data Analytics v2 Exam Sample Questions (Q220-Q225):

NEW QUESTION # 220
What is holdout data?
Response:

A. a subset of the provided data set that is removed by the data scientist because it contains outliers
B. a subset of the provided data set that is removed by the data scientist because it contains data errors
C. a subset of the provided data set selected at random and used to validate the model
D. a subset of the provided data set selected at random and used to initially construct the model

Answer: C

NEW QUESTION # 221
Refer to the exhibit.

You have plotted the distribution of savings account sizes for your bank. How would you proceed, based on this distribution?
Response:

A. The data is extremely skewed. Split your analysis into two cohorts: accounts less than 2500, and accounts greater than 2500
B. The accounts of size greater than 2500 are rare, and probably outliers. Eliminate them from your future analysis.
C. The data is extremely skewed. Replot the data on a logarithmic scale to get a better sense of it.
D. The data is extremely skewed, but looks bimodal; replot the data in the range 2, 500-10, 000 to be sure.

Answer: C

NEW QUESTION # 222
You have numeric data for more than 500 observations. You are interested in identifying linear relationships among these numeric variables. Which R function should you employ to get the best visualization?
Response:

A. lm()
B. plot(density())
C. pairs()
D. rug()

Answer: C

NEW QUESTION # 223
Which word or phrase completes the statement; "Discovering relationships is to Association Rules as generating forecasts is to __________."?
Response:

A. Classification
B. Time Series Analysis
C. Text Analysis
D. Clustering

Answer: B

NEW QUESTION # 224
In a Logistic Regression, the coefficient for "age" equals -3. What is the correct interpretation of the Logistic Regression coefficient, holding all other variables constant?
Response:

A. When age decreases by 3 units, the odds of response are multiplied by e(-3) or 0.05
B. For every 1 unit increase in age, the dependent variable is reduced by 3 units
C. For every 1 unit increase in age, the dependent variable is multiplied by -3
D. When age increases by 1 unit, the odds of response are multiplied by e(-3) or 0.05

Answer: D

NEW QUESTION # 225
......

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