A Data Scientist Has Explored and Sanitized a Dataset in Preparation

question 31

Multiple Choice

A data scientist has explored and sanitized a dataset in preparation for the modeling phase of a supervised learning task. The statistical dispersion can vary widely between features, sometimes by several orders of magnitude. Before moving on to the modeling phase, the data scientist wants to ensure that the prediction performance on the production data is as accurate as possible. Which sequence of steps should the data scientist take to meet these requirements?

• A) Apply random sampling to the dataset. Then split the dataset into training, validation, and test sets.
• B) Split the dataset into training, validation, and test sets. Then rescale the training set and apply the same scaling to the validation and test sets.
• C) Rescale the dataset. Then split the dataset into training, validation, and test sets.
• D) Split the dataset into training, validation, and test sets. Then rescale the training set, the validation set, and the test set independently.

Comprehend the role of the cerebral cortex and its importance to human brain function.

Understand the functions of subcortical structures such as the amygdala, thalamus, and hypothalamus.

Describe the impact of brain damage on emotional, motivational, and sensory functions.

Recognize the significance of the limbic system in controlling emotions and motivation.

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Definitions:

Accrual-Based Sales Revenue

Revenue recognized when earned, regardless of when the payment is received, following the accrual basis of accounting.

Ending Inventory

The worth of merchandise ready for sale when an accounting period concludes, determined by adding beginning inventory and purchases, then subtracting the cost of goods sold.

Retained Earnings

The cumulative amount of profits kept in a company after dividends are paid, used for reinvestment in the business or to pay down debt.

Comprehensive Income

The total change in equity for a reporting period other than from transactions with owners, including all revenues, gains, expenses, and losses.