Consider these itemsets:
(hat, scarf, coat) (hat, scarf, coat, gloves) (hat, scarf, gloves) (hat, gloves) (scarf, coat, gloves)
What is the confidence of the rule (gloves -> hat)?
A. 75%
B. 60%
C. 66%
D. 80%
What is holdout data?
A. a subset of the provided data set selected at random and used to validate the model
B. a subset of the provided data set selected at random and used to initially construct the model
C. a subset of the provided data set that is removed by the data scientist because it contains data errors
D. a subset of the provided data set that is removed by the data scientist because it contains outliers
Which characteristic applies mainly to Data Science as opposed to Business Intelligence?
A. Advanced analytical methods
B. Robust reporting
C. Focus on structured data
D. Data dashboards
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"
What is an appropriate data visualization to use in a presentation for a project sponsor?
A. Bar chart
B. Pie chart
C. Box and Whisker plot
D. Density plot
In a Student's t-test, what is the meaning of the p-value?
A. it is the area under the appropriate tails of the Student's distribution
B. it is the "power" of the Student's t-test
C. it is the mean of the distribution for the null hypothesis
D. it is the mean of the distribution for the alternate hypothesis
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?
A. quicker time to insight
B. more efficient handling of categorical values
C. improved connections between disparate data sources
D. full use of data aggregation functionality
You have been assigned to do a study of the daily revenue effect of a pricing model of online transactions. When have you completed the analytics lifecycle?
A. You have written documentation,and the code has been handed off to the Data Base Administrator and business operations.
B. You have a completely developed model,and the results have shown statistically acceptable results.
C. You have presented the results of the model to both the internal analytics team and the business owner of the project.
D. You have a completely developed model based on both a sample of the data and the entire set of data available.
What is required in a presentation for project sponsors?
A. The "Big Picture" takeaways for executive level stakeholders
B. Data warehouse design changes
C. Line by line review of the developed code
D. Detailed statistical basis for the modeling approach used in the project
A data scientist wants to predict the probability of death from heart disease based on three risk factors: age, gender, and blood cholesterol level.
What is the most appropriate method for this project?
A. Logistic regression
B. Linear regression
C. K-means clustering
D. Apriori algorithm
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