Answer both the two questions a and b below $(5\mathrm{.}5+2)$

a$)$ Sony has outlets in several citles in USA. The general sales manager aired a tv advertisement. digital camera on local TV stations prior to a sale in Christmas season. She obtained the information for Saturday$-$Sunday digital camera sales at the various outlets and paired it wit the number of times the advertisement was shown on the local TV stations. The purpose is: find whether there is any relationship between the number of times the advertisement was aired and digital camera sales.

$\backslash$table$[[\backslash$table$[[$Location of TV$],[$station$]],\backslash$table$[[$Number of$],[$airings$]],\backslash$table$[[$Sales $($in $5],[$thousands$)]]],[$Boston$,6,24],[$California$,3,17],[$Providence$,4,15],[$Springfield$,2,8],[$New Heaven,$5,21]]$