EMC Dell Data Science Foundations - D-DS-FN-23 模擬練習
The R vector "v" contains 16 elements.
Which R command modifies the vector to have the same elements in reverse order?
Which R command modifies the vector to have the same elements in reverse order?
正解: B
Which of the following is an example of quasi-structured data?
正解: A
What is required in a presentation for project sponsors?
正解: B
Refer to the exhibit.
Which type of data issue would you suspect based on the exhibit?
Which type of data issue would you suspect based on the exhibit?
正解: B
The average purchase size from your online sales site is $17, 200. The customer experience team believes a certain adjustment of the website will increase sales.
A pilot study on a few hundred customers showed an increase in average purchase size of $1.47, with a significance level of p=0.1. The team runs a larger study, of a few thousand customers.
The second study shows an increased average purchase size of $0.74, with a significance level of 0.03.
What is your assessment of this study?
A pilot study on a few hundred customers showed an increase in average purchase size of $1.47, with a significance level of p=0.1. The team runs a larger study, of a few thousand customers.
The second study shows an increased average purchase size of $0.74, with a significance level of 0.03.
What is your assessment of this study?
正解: D
How is dimensionality defined in a "bag of words" document representation?
正解: B
What is Hadoop?
正解: C
Which data type value is used for the observed response variable in a logistic regression model?
正解: D
Refer to the exhibit.
Click on the calculator icon in the upper left corner. An analyst is searching a corpus of documents for the topic "solid state disk".
In the Exhibit, Table A provides the inverse document frequency for each term across the corpus. Table B provides each term's frequency in four documents selected from corpus.
Which of the four documents is most relevant to the analyst's search?
Click on the calculator icon in the upper left corner. An analyst is searching a corpus of documents for the topic "solid state disk".
In the Exhibit, Table A provides the inverse document frequency for each term across the corpus. Table B provides each term's frequency in four documents selected from corpus.
Which of the four documents is most relevant to the analyst's search?
正解: B
Refer to the exhibit.
Click on the calculator icon in the upper left corner.
You are given a list of predefined association rules:
A) RENTER => BAD CREDIT
B) RENTER => GOOD CREDIT
C) HOME OWNER => BAD CREDIT
D) HOME OWNER => GOOD CREDIT
E) FREE HOUSING => BAD CREDIT
F) FREE HOUSING => GOOD CREDIT
For your next analysis, you must limit your dataset based on rules with confidence greater than 60%.
Which of the rules will be kept in the analysis?
Click on the calculator icon in the upper left corner.
You are given a list of predefined association rules:
A) RENTER => BAD CREDIT
B) RENTER => GOOD CREDIT
C) HOME OWNER => BAD CREDIT
D) HOME OWNER => GOOD CREDIT
E) FREE HOUSING => BAD CREDIT
F) FREE HOUSING => GOOD CREDIT
For your next analysis, you must limit your dataset based on rules with confidence greater than 60%.
Which of the rules will be kept in the analysis?
正解: B
Which characteristic applies only to Business Intelligence as opposed to Data Science?
正解: A
Data visualization is used in the final presentation of an analytics project.
For what else is this technique commonly used?
For what else is this technique commonly used?
正解: C