A researcher is 95% confident and the interval from 3.6 hours to 8.1 hours captures = true minimum of daily screen time for us adults is there evidence that the true mean number of hours of screen time for us adults is greater than 3.5

Sport City has the better deal

Step-by-step explanation:

At Sport City, the cost of the tennis racket would be:

180  ⋅  0.85 = $ 153

(I used 0.85 instead of 0.15 because 0.15 is finding the discount amount, not the actual amount after the discount. Got 0.85 by subtracting 0.15 from 1.)

At Tennis World, the cost of the tennis racket would be:

$ 200 ⋅  0.80 = $ 160

(I used 0.80 instead of 0.20 because 0.20 is finding the discount amount, not the actual amount after the discount. Got 0.80 by subtracting 0.20 from 1.)

Sport City has the better deal because after the discount it is selling the racket for  

$ 153

, while Tennis World is selling it for  

$ 160

. Tennis World is selling it for  

$ 7

more than Sport City.