In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Tetrachoric correlation is _ artificially dichotomous variables.
[EX A]: two

[EX Q]: World population continues to rise, even as a few countries move toward _ growth.
[EX A]: zero

[EX Q]: Statistics show that within _ years of divorce, many people marry a second time.
[EX A]:
three