tablet computers using factors such as cost$,$ type of operating system, display size, battery life, and CPU manufacturer. A sample of $10$ tablet computers is shown.

$\backslash$table$[[,$Cost $($$$),\backslash$table$[[$Operating$],[$System$]],\backslash$table$[[$Display Size$],[($inches$)]],\backslash$table$[[$Battery Life$],[($hours$)]],\backslash$table$[[$CPU$],[$Manufacturer$]]],[$Acer Iconia W$510,599,$Windows,$10\mathrm{.}1,8\mathrm{.}5,$Intel$],[$Amazon Kindle Fire HD$,299,$Android,$8\mathrm{.}9,9,$TI OMAP$],[$Apple iPad $4,499,$iOS,$9\mathrm{.}7,11,$Apple$],[$HP Envy X$2,860,$Windows,$11\mathrm{.}6,8,$Intel$],[$Lenovo ThinkPad Tablet,$668,$Windows,$10\mathrm{.}1,10\mathrm{.}5,$Intel$],[$Microsoft Surface Pro,$899,$Windows,$10\mathrm{.}6,4,$Intel$],[$Motorola Droid XYboard,$530,$Android,$10\mathrm{.}1,9,$TI OMAP$],[$Samsung Ativ Smart PC$,590,$Windows,$11\mathrm{.}6,7,$Intel$],[$Samsung Galaxy Tab,$525,$Android,$10\mathrm{.}1,10,$Nvidia$],[$Sony Tablet S$,360,$Android,$9\mathrm{.}4,8,$Nvidia$]]$

How many elements are in this data set?

How many variables are in this data set?

Which variables are categorical?

Which variables are quantitative?

What type of measurement scale is used for cost?

What type of measurement scale is used for operating system?

What type of measurement scale is used for display size?

What type of measurement scale is used for battery life?

What type of measurement scale is used for CPU manufacturer?