The Yearbook staff wanted to find out how many students would buy a yearbook So, the staff surveyed 15 student who were in the school library after school. The results are in the graph. Is this sampling valid? If so, about how many of the 1287 students would buy a yearbook?

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?