Rubin, a freelance software developer, has a meeting with an independent bakery owner to discuss a potential project. Before meeting with the client, Rubin does a thorough research on the client's business and the client's educational background. He develops his proposal accordingly, ensuring to use common words instead of technical jargon. In the given scenario, which of the following communication guidelines does Rubin follow? A) Avoid bias.
B) Avoid the use of slang.
C) Be concise.
D) Analyze your audience.

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