Theexamplein Section 3.1.4 describedanexperimenttoestimatethemeansaleswitha proposedmenuforanewrestaurant.Inarevisedexperimenttocomparetwomenus,onTuesday of theopeningweektheownergivescustomersmenuAandonWednesdayshegivesthemmenu B. Thebillsaverage$22.30forthe43customersonTuesday(s = 6.88) and$25.91forthe50 customers onWednesday(s = 8.01). Underthestrongassumptionthathercustomerseachnight are comparabletoarandomsamplefromtheconceptualpopulationofpotentialcustomers, showhowtocomparethemeansalesforthetwomenusbasedon(a)the P-valueofasignificance test, (b)a95%confidenceinterval.Whichismoreinformative,andwhy?(Whenusedinan experimenttocomparetwotreatmentstodeterminewhichworksbetter,atwo-sampletestis often calledan A/B test.) .