Which of the following represents a function? A. x -9 -9 -3 -3 y 19 17 19 18 B. x -11 -9 -11 5 y 19 19 25 18 C. x -11 -9 -3 -9 y 19 17 19 18 D. x -11 -9 -3 5 y 19 17 25 19

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?