Questions from Business Statistics

Q: Marine biologists warn that the growing number of powerboats registered in Florida

Marine biologists warn that the growing number of powerboats registered in Florida threatens the existence of manatees. The data in the table come from the Florida Fish and Wildlife Conservation Commi...

Q: Exercise R2.7 examined the correlation between BCI and pH in

Exercise R2.7 examined the correlation between BCI and pH in streams sampled in the Adirondack Mountains. Here is the corresponding regression model: Response variable is: BCI R-squared = 27.1% s = 14...

Q: Researchers identified 242 children in the Cleveland area who had been born

Researchers identified 242 children in the Cleveland area who had been born prematurely (at about 29 weeks). They examined these children at age 8 and again at age 20, comparing them to another group...

Q: Some doctors have expressed concern that men who have vasectomies seemed more

Some doctors have expressed concern that men who have vasectomies seemed more likely to develop prostate cancer. Medical researchers used a national cancer registry to identify 923 men who had had pro...

Q: Students were asked how many songs they had in their digital music

Students were asked how many songs they had in their digital music libraries. Here a display of the responses: 1. What aspect of this distribution makes it difficult to summarize, or to discuss, cente...

Q: Widely used antidepressants may reduce ominous brain plaques associated with Alzheimer disease

Widely used antidepressants may reduce ominous brain plaques associated with Alzheimer disease. In the study, mice genetically engineered to have large amounts of brain plaque were given a class of an...

Q: An artisan wants to create pottery that has the appearance of age

An artisan wants to create pottery that has the appearance of age. He prepares several samples of clay with four different glazes and test fires them in a kiln at three different temperature settings....

Q: Tests of gene therapy on laboratory rats have raised hopes of stopping

Tests of gene therapy on laboratory rats have raised hopes of stopping the degeneration of tissue that characterizes chronic heart failure. Researchers at the University of California, San Diego, used...

Q: People aged 50 to 71 were initially contacted in the mid-

People aged 50 to 71 were initially contacted in the mid-1990s to participate in a study about smoking and bladder cancer. Data were collected from more than 280,000 men and 186,000 women from eight s...

Q: An orange-juice processing plant will accept a shipment of fruit

An orange-juice processing plant will accept a shipment of fruit only after several hundred oranges selected from various locations within the truck are carefully inspected. If too many show signs of...