$1.$ Which of the following topics is the most appropriate to apply quantitative research? $[]$

$($a$)$ Generate ideas $($b$)$ Estimate the size of market segments

$($c$)$ Clarify what the research results mean $($d$)$ Understand consumer motivations

$2.$ What is the role of a model? $[]$

$($a$)$ It brings the objectivity into the analysis $($b$)$ It is used as the raw information to analyze

$($c$)$ It provides the framework for analyzing data. $($d$)$ It enables accurate calculations.

$3.$ Which of the following describes the correlation $-1\mathrm{.}0$ between A and B most appropriately? $[]$

$($a$)$ A and B are related but not closely. $($b$)$ A and B are not related at all.

$($c$)$ A and B are perfectly related, and they move in the same directions.

$($d$)$ A and B are perfectly related, and they move in opposite directions.