Questions from Essentials of Statistics

Q: In a study by J. Zeng et al., three materials

In a study by J. Zeng et al., three materials for making artificial teeth—Endura, Duradent, and Duracross—were tested for hardness. Their results were published as the paper “In Vitro Wear Resistance...

Q: An F-curve has df = (8, 19).

An F-curve has df = (8, 19). What is the number of degrees of freedom for the: a. denominator? b. numerator?

Q: Considerable controversy exists over whether long-term neurodevelopment is affected by

Considerable controversy exists over whether long-term neurodevelopment is affected by nutritional factors in early life. A. Lucas and R. Morley summarized their findings on that question for preterm...

Q: A clinical study was conducted to see whether an antibody called denosumab

A clinical study was conducted to see whether an antibody called denosumab is effective in treatment of osteoporosis of postmenopausal women, as reported in the article “Denosumab in Postmenopausal Wo...

Q: Entanglement of marine mammals in fishing gear is a global issue and

Entanglement of marine mammals in fishing gear is a global issue and a significant threat to minke whales, in particular. In the article “Fishing Gears Involved in Entanglements of Minke Whales (Balae...

Q: The National Association of Colleges and Employers(NACE) conducts surveys

The National Association of Colleges and Employers(NACE) conducts surveys on salary offers to college graduates by field and degree. Results are published in Salary Survey. The following table provide...

Q: Nielsen Media Research collects information on daily TV viewing time, in

Nielsen Media Research collects information on daily TV viewing time, in hours, and publishes its findings in Time Spent Viewing. The WeissStats site provides data on daily viewing times of independen...

Q: An article by J. Puranen of the Department of Statistics,

An article by J. Puranen of the Department of Statistics, University of Helsinki, discussed a classic study on several variables of seven different species of fish caught in Lake Laengelmaevesi, Finla...

Q: In the article “Comparison of the Atkins, Ornish, Weight

In the article “Comparison of the Atkins, Ornish, Weight Watchers, and Zone Diets for Weight Loss and Heart Disease Risk Reduction” (Journal of the American Medical Association, Vol. 293, No. 1, pp. 4...

Q: In the article by P. Ridker et al. titled “

In the article by P. Ridker et al. titled “A Randomized Trial of Low-dose Aspirin in the Primary Prevention of Cardiovascular Disease in Women” (New England Journal of Medicine, Vol. 352, pp. 1293–130...