Recently, a bank was trying to decide what fee to charge for "expedited payments"long dash payments that the bank would transmit extra speedily to enable customers to avoid late fees on cable tv bills, electric bills, and the like. to try to determine what fee customers were willing to pay for expedited payments, the bank conducted a survey. it was able to determine that many of the people surveyed already paid fees for services that exceeded the maximum fees that they said they were willing to pay. this illustrates that

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