In order to perform text mining, analysts must first apply $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ to unstructured data. $19.\_\_\_\_\_\_\_\_\_\_$ data are expressed in numbers $($continuous or discrete$)$ and represent a value. $\_\_\_\_\_\_\_\_\_\_$ data are categorical, and while they may be expressed in numbers as well, these numbers would only be ordinal or nominal. $20.$ Prescriptive analytics are primarily about these two techniques: $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ and $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.21.$ What four characteristics separate Big Data from other BI data: $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ and $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.22.\_\_\_\_\_\_\_\_\_\_$ is a Big Data distributed file system built on many inexpensive servers that provide redundancy and quick response to queries based on massive volumes of data. $23.\_\_\_\_\_\_\_\_\_\_$ is a programming model that allows a programmer to write a program which gets processed on the many inexpensive distributed servers and the results are returned and accumulated for the user. $24.\_\_\_\_\_\_\_\_\_\_$ is a new database model for storing and processing discrete multi$-$structured Big Data for end users or automated Big Data applications. $25.\_\_\_\_\_\_\_\_\_\_$ is a new Big Data position in which the employee needs to be skilled at statistics, technology, business and communications.