A random variable X can take on the value 0, 1, 2, or 3. Which of the following is a possible probability model for X ? X 0 1 2 3 P ( X ) 0.5 0.2 0.4 -0.1 X 0 1 2 3 P ( X ) 0.2 0.1 0.2 0.3 X 0 1 2 3 P ( X ) 0.5 0.3 0.1 0.1 X 0 1 2 3 P ( X ) 0.3 0.3 0.3 0.3

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?