Consider the following excerpt from a database that a start$-$up company is building in order to analyze sales trends.

Order Number

Region of the Country

Area Code

Customer Rating

Weight of Purchase $($lb$)$

Number of Items Purchased

$10506$

$2$

$204$

A$+$

$65\mathrm{.}72$

$4$

$10611$

$1$

$314$

B

$127\mathrm{.}43$

$5$

$11901$

$2$

$212$

B$+$

$3\mathrm{.}81$

$3$

$12709$

$3$

$612$

C$-$

$73\mathrm{.}93$

$4$

$12917$

$4$

$526$

A$+$

$113\mathrm{.}26$

$6$

$*$Region of the Country $(1=$ East, $2=$ South, $3=$ Midwest, $4=$ West$)$

$1)$ How many individuals are shown in the table above?

$5$

$2)$ True or False: Qualitative variables are usually expressed as words, but can be expressed as numbers?

True

$3)$ True or False: Area Code is a quantitative variable?

False

$4)$ What type of variable is Region of the Country?

Qualitative $-$ nominal

$5)$ What type of variable is Customer Rating?

Quantitative $-$ discrete

$6)$ What type of variable is Weight of Purchase?

$[$ Select $]$

$7)$ What type of variable is Number of Items Purchaced?

$[$ Select $]$

$8)$ An identifier variable is a special type of qualitative variable in which every category has a single, unique entry. A student ID number is an example of an identifier variable. It's important to be able to recognize an identifier variable within in a data set because you would not want to attempt to summarize or display this type of data. In the data set above, which variable is an identifier variable?