Latest Questions & Answers

Q: In the paper “Cloudiness: Note on a Novel Case of

In the paper “Cloudiness: Note on a Novel Case of Frequency” (Proceedings of the Royal Society of London, Vol. 62, pp. 287–290), K. Pearson examined data on daily degree of cloudiness, on a scale of 0...

Q: The National Center for Health Statistics publishes information about birth rates (

The National Center for Health Statistics publishes information about birth rates (per 1000 population) in the document National Vital Statistics Report. The following table provides a frequency distr...

Q: From the document National Vital Statistics Reports, a publication of the

From the document National Vital Statistics Reports, a publication of the National Center for Health Statistics, we obtained the following frequency distribution for the ages of women who became mothe...

Q: A data set consists of 2m2 − 1 zeros, one −

A data set consists of 2m2 − 1 zeros, one −m, and one m. a. Compute x¯ and s for this data set. b. How many standard deviations from the mean is the observation m? c. Assuming that m ≥ 4, what percent...

Q: From the paper “Effects of Chronic Nitrate Exposure on Gonad Growth

From the paper “Effects of Chronic Nitrate Exposure on Gonad Growth in Green Sea Urchin Strongylocentrotus droebachiensis” (Aquaculture, Vol. 242, No. 1–4, pp. 357–363) by S. Siikavuopio et al., we fo...

Q: Assume that the variable under consideration has a density curve. Note

Assume that the variable under consideration has a density curve. Note that the answers required here may be only approximately correct. The percentage of all possible observations of the variable tha...

Q: In a classic study, described by F. Yates in The

In a classic study, described by F. Yates in The Design and Analysis of Factorial Experiments (Commonwealth Bureau of Soils, Technical Communication No. 35), the effect on oat yield was compared for t...

Q: As reported in Runner’s World magazine, the times of the finishers

As reported in Runner’s World magazine, the times of the finishers in the New York City 10-km run are normally distributed with mean 61 minutes and standard deviation 9 minutes. Let x denote finishing...

Q: According to the National Health and Nutrition Examination Survey, published by

According to the National Health and Nutrition Examination Survey, published by the National Center for Health Statistics, the serum (noncellular portion of blood) total cholesterol level of U.S. fema...

Q: One of the larger species of tarantulas is the Grammostola mollicoma,

One of the larger species of tarantulas is the Grammostola mollicoma, whose common name is the Brazilian giant tawny red. A tarantula has two body parts. The anterior part of the body is covered above...