Practice Quiz | WEEK 3

What are the requirements in order for data to be reliable? (Select all that apply) Data should be structured Data should be free of all errors Data should be relevant Data should be easy to collect

Data should be free of all errors Data should be relevant

What type of data is semi-structured and has some organizational properties but not a rigid schema? Web logs Data from OLTP systems Emails Online forms

Emails

What is data called that does not fit within the context of the use case? Irrelevant data Relevant data Duplicate data Missing data

Irrelevant data

What is one of the common structural transformations used for combining data from one or more tables? Joins Denormalization Cleaning Normalization

Joins

What type of data is produced by wearable devices, smart buildings, and medical devices? Observation study data Census data Survey data Sensor data

Sensor data

What tool allows you to discover, cleanse, and transform data with built-in operations? Google DataPrep Watson Studio Refinery Trifacta Wrangler OpenRefine

Watson Studio Refinery