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 $6,400 per day. From past history,the restaurant knew that its population standard deviation is about $1,000. The value of the test statistic is ________.
A)2.8
B)6,000
C)6,400
D)1.96

Question

Quizplus · Accepted Answer

The test statistic is calculated using the formula (sample mean - population mean) / (population standard deviation / sqrt(sample size)). Plugging in the given values, we get (6400-6000) / (1000/sqrt(49)) = 2.8. Therefore, the answer is choice A.

Sales at a Fast-Food Restaurant Average $6,000 Per Day