Kenneth chenault, the ceo of american express co. hopes to issue american express cards through u. s. banks. at present, banks that own visa and mastercard are not allowed to issue other types of credit cards. however, the supreme court may rule that visa and mastercard stifle competition and innovation by preventing banks that own these two cards from issuing competitive cards. which of the following environmental forces would have the most impact on chenault's decision to issue cards through u. s. banks?

Sales at a fast-food restaurant average $6,000 per day. the restaurant decided to introduce an advertising campaign to increase daily sales. to determine the effectiveness of the advertising campaign, a sample of 49 days of sales were taken. they found that the average daily sales were $6,300 per day. from past history, the restaurant knew that its population standard deviation is about $1,000. if the level of significance is 0.01, have sales increased as a result of the advertising campaign? multiple choicea)fail to reject the null hypothesis.b)reject the null hypothesis and conclude the mean is higher than $6,000 per day.c)reject the null hypothesis and conclude the mean is lower than $6,000 per day.d)reject the null hypothesis and conclude that the mean is equal to $6,000 per day.expert answer