Questions from Essentials of Statistics

Q: Taking the family to an amusement park has become increasingly costly according

Taking the family to an amusement park has become increasingly costly according to the industry publication Amusement Business, which provides figures on the cost for a family of four to spend the day...

Q: As reported by B. Warner and J. Rutledge in the

As reported by B. Warner and J. Rutledge in the paper “Checking the Chips Ahoy! Guarantee” (Chance, Vol. 12, Issue 1, pp. 10–14), a random sample of forty-two 18-ounce bags of Chips Ahoy! cookies yiel...

Q: The webpage “Bottlenose Dolphin” produced by the National Geographic Society

The webpage “Bottlenose Dolphin” produced by the National Geographic Society provides information about the bottlenose dolphin. A random sample of 50 adult bottlenose dolphins have a mean length of 12...

Q: The annual update of U.S. Overseas Loans and Grants

The annual update of U.S. Overseas Loans and Grants, informally known as the “Greenbook,” contains data on U.S. government monetary economic and military assistance loans. The following table shows mi...

Q: Refer to the weight data. Note that there are 37 observations

Refer to the weight data. Note that there are 37 observations, the smallest and largest of which are 129.2 and 278.8, respectively. Apply the preceding procedure to choose classes for cutpoint groupin...

Q: R. Nielsen et al. compared 13,731 annotated genes

R. Nielsen et al. compared 13,731 annotated genes from humans with their chimpanzee orthologs to identify genes that show evidence of positive selection. The researchers published their findings in “A...

Q: In the article “The $350,000 Club” (

In the article “The $350,000 Club” (The Business Journal, Vol. 24, Issue 14, pp. 80–82), J. Trunelle et al. examined Arizona public-company executives with salaries and bonuses totaling over $350,000....

Q: In the special report “Mousetrap: The Most-Visited Shoe

In the special report “Mousetrap: The Most-Visited Shoe and Apparel E-tailers” (Footwear News, Vol. 58, No. 3, p. 18), we found the following data on the average time, in minutes, spent per user per m...

Q: The subterranean coruro (Spalacopus cyanus) is a social rodent that

The subterranean coruro (Spalacopus cyanus) is a social rodent that lives in large colonies in underground burrows that can reach lengths of up to 600 meters. Zoologists S. Begall and M. Gallardo stud...

Q: x¯ = 35, n = 25, σ = 4

x¯ = 35, n = 25, σ = 4 a. Find a 95% confidence interval for the population mean. b. Identify and interpret the margin of error. c. Express the endpoints of the confidence interval in terms of the poi...