Questions from Essentials of Statistics

Q: A data set of size 152 with roughly a bell-shaped

A data set of size 152 with roughly a bell-shaped distribution has mean 25 and standard deviation 4. Approximately how many observations lie between 17 and 33?

Q: Regarding the five-number summary: a. Identify its

Regarding the five-number summary: a. Identify its components. b. How can it be employed to describe center and variation? c. What graphical display is based on it?

Q: Regarding outliers: a. What is an outlier?

Regarding outliers: a. What is an outlier? b. Explain how you can identify potential outliers, using only the first and third quartiles.

Q: Regarding z-scores: a. How is a z

Regarding z-scores: a. How is a z-score obtained? b. What is the interpretation of a z-score? c. An observation has a z-score of 2.9. Roughly speaking, what is the relative standing of the observation...

Q: An integral part of doing business in the dot-com culture

An integral part of doing business in the dot-com culture of the late 1990s was frequenting the party circuit centered in San Francisco. Here high-tech companies threw as many as five parties a night...

Q: The National Center for Health Statistics publishes information on the duration of

The National Center for Health Statistics publishes information on the duration of marriages in Vital Statistics of the United States. Which measure of center is more appropriate for data on the durat...

Q: The U.S. National Center for Health Statistics collects data

The U.S. National Center for Health Statistics collects data on causes of death and publishes its findings in National Vital Statistics Reports. Which of the three main measures of center is appropria...

Q: In the article “Fossil Argonauts (Mollusca: Cephalopoda: Octopodida

In the article “Fossil Argonauts (Mollusca: Cephalopoda: Octopodida) from Late Miocene Siltstones of the Los Angeles Basin, California” (Journal of Paleontology, Vol. 79, No. 3, pp. 520–531), paleonto...

Q: In Issue 338 of the Amstat News, thenpresident of the American

In Issue 338 of the Amstat News, thenpresident of the American Statistical Association, F. Scheuren, reported the results of a survey on how members would prefer to receive ballots in annual elections...

Q: In the paper “Injuries and Risk Factors in a 100-

In the paper “Injuries and Risk Factors in a 100-Mile (161-km) Infantry Road March” (Preventative Medicine, Vol. 28, pp. 167–173), K. Reynolds et al. reported on a study commissioned by the U.S. Army....