Charles Schwab in 1971 was determined to build a stock brokerage firm that would be different. He cited that he was disturbed by the conflict of interest between the stockbrokers and their clients. Brokers were commonly known for convincing clients to make questionable transactions to increase their commissions. What did Charles Schwab see as a current issue in the stock brokering industry?

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