Conventions

Code words in the text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Three of the columns, Year of Birth, Height, and Number of Doctor Visits, are quantitative because they are represented by numbers."

Words that you see on the screen (for example, in menus or dialog boxes) also appear in the text like this: "Choose the Delimited option in the Text Import Wizard dialog box, and make sure that you start the import at row 1."

A block of code is set as follows:

SELECT *
FROM products
WHERE production_end_date IS NULL;

New terms and important words are shown like this: "Statistics can be further divided into two subcategories: descriptive statistics and inferential statistics."