Ernesto is a web developer who is looking to determine which of two types of advertisements are the most cost effective. He suspects that advertisements with animations generate more clicks than advertisements without animations, but wants to confirm his intuition before he starts recommending advertisements with animations to his clients. Ernesto creates advertisements with animations for $8$ different products and then creates advertisements without animations for those same products. Then, he measures the click$-$through rate for those advertisements. The results $($given as percentages of total visitors to the site who clicked on the advertisement$)$ are shown in the table below:

Note: $d=($without animations $-$ with animations$)$