Suppose that for events E and F, P(E) = m, P(F) = n, and the probability that both E and F occur is mn. Then events E and F must be

A) certain.
B) dependent.
C) disjoint.
D) independent.

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?