Refer to the accompanying data s estimate of the mean drive-through service time
ID: 3065041 • Letter: R
Question
Refer to the accompanying data s estimate of the mean drive-through service time for Restaurant X at dinner; then do the same for Restaurant Y. Compare the results. Click the icon to view the data on drive-through service times. et of mean drive-through service times at dinner in seconds at two fast food restaurants. Construct a 90% confidence interval esamor RestauntCput Construct a 90% confidence interval of the mean drive-through service times at dinner for Restaurant X. (Round to one decimal place as needed.)Explanation / Answer
Solution:- Given that Values
Restaurant X : 82,121,119,141,265,179,123,149,158,215,336,307,178,113,157,146,92,236,242,185,154,198,165,123,62,203,181,120,140,168,187,195,232,191,348,300,206,196,179,192,111,150,173,154,175,157,166,125,137,306
=> X = 178.76 , Sd = 62.5553 , n = 50 , df = n-1 = 49 , t = 1.68
=> 90% confidence interval of the mean drive through service times at dinner for Restaurant X
= X +/- t*sd/sqrt(n)
= 178.76 +/- 1.68*62.5553/sqrt(50)
= 163.9, 193.6