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EMC Dell Data Science Foundations Sample Questions (Q27-Q32):

NEW QUESTION # 27
What describes a true limitation of a Logistic Regression method?

A. Does not handle correlated variables well
B. Does not handle missing values well
C. Does not handle redundant variables well
D. Does not have explanatory values

Answer: B

NEW QUESTION # 28
When would you use GROUP BY ROLLUP clause in your OLAP query?

A. where only specific subtotals and grand totals for a combination of variables are to be included in the output
B. where only the subtotals are to be included in the output
C. where only the grand totals are to be included in the output
D. where all subtotals and grand totals are to be included in the output

Answer: D

NEW QUESTION # 29
Refer to the exhibit.

In the exhibit, a correlogram is provided based on an autocorrelation analysis of a sample dataset.
What can you conclude from only this exhibit?

A. There is no structure left to model in the data
B. Lag 7 has a significant negative autocorrelation
C. There is significant autocorrelation through lag 3
D. Differencing is required before proceeding with any analysis

Answer: C

NEW QUESTION # 30
Refer to the exhibit.

You have scored your Naive bayesian classifier model on a hold out test data for cross validation and determined the way the samples scored and tabulated them as shown in the exhibit.
What are the the False Positive Rate (FPR) and the False Negative Rate (FNR) of the model?

A. FPR = 26/288 FNR = 15/262
B. FPR = 288/26 FNR = 262/15
C. FPR = 15/262 FNR = 26/288
D. FPR = 262/15 FNR = 288/26

Answer: C

NEW QUESTION # 31
Amajor health care company with 2,500 hospitals acquired a company with 1,500 hospitals. In the year following the company merger, all the health care records have been digitized and loaded into a new centralized data warehouse.
Each individual's health record now includes all doctor's notes and medical images taken. There are currently hundreds of models and reports in production that were built in the original data warehouse.
Since the merger, these models have become outdated and need to be re-evaluated. You have been assigned to update the models that predict the hospital visitation pattern and resource usage of individuals with chronic diseases.
Which steps of the analytic project should be performed in the database?

A. Model design and bootstrapping for model evaluation
B. Data processing and scoring new individual records in production
C. Model evaluation and A/B testing
D. Data processing, variable selection, model building and scoring

Answer: D

NEW QUESTION # 32
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