Mr. Roy is a sincere and hardworking person who does his job quietly and does not like to argue much. He prefers to write notes and send written messages instead of face-to-face interaction. He is being given the responsibility of leading a team to handle a prestigious project. But before that he has to get the project approved by the board of directors. Can you suggest what style of communication he should use to make it a success?

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