Questions from Business Statistics

Q: The radioactive gas radon, found in some homes, poses a

The radioactive gas radon, found in some homes, poses a health risk to residents. To assess the level of contamination in their area, a county health department wants to test a few homes. If the risk...

Q: Wayne Collier designed an experiment to measure the fuel efficiency of his

Wayne Collier designed an experiment to measure the fuel efficiency of his family car under different tire pressures. For each run, he set the tire pressure to either 28 or 32 psi and then measured th...

Q: There are 20 first-class passengers and 120 coach passengers scheduled

There are 20 first-class passengers and 120 coach passengers scheduled on a flight. In addition to the usual security screening, 10% of the passengers will be subjected to a more complete search. 1. D...

Q: Carsten, Matt, and Rainer designed an experiment to see how

Carsten, Matt, and Rainer designed an experiment to see how different environments affect the Internet speed around campus. They used their own Mac computer and a PC belonging to the school and tested...

Q: Data were collected over a decade from 1021 men and women with

Data were collected over a decade from 1021 men and women with a recent history of precancerous colon polyps. Participants were randomly assigned to receive folic acid (a B vitamin) or a placebo, and...

Q: In the journal Science, a research team reported that plants in

In the journal Science, a research team reported that plants in southern England are flowering earlier in the spring. Records of the first flowering dates for 385 species over a period of 47 years ind...

Q: Fireworks manufacturers face a dilemma. They must be sure that the

Fireworks manufacturers face a dilemma. They must be sure that the rockets work properly, but test-firing a rocket essentially destroys it. On the other hand, not testing the product leaves open the d...

Q: People who read the last page of a mystery novel first generally

People who read the last page of a mystery novel first generally like stories better. Researchers recruited 819 college students to read short stories, and for one story, they were given a spoiler par...

Q: Does keeping a child lunch in an insulated bag, even with

Does keeping a child lunch in an insulated bag, even with ice packs, protect the food from warming to temperatures where germs can proliferate? Researchers used an electric temperature gun on 235 lunc...

Q: Because of the skewness of the distributions of fusion times described in

Because of the skewness of the distributions of fusion times described in Exercise 49, we might consider a re-expression. Here are the boxplots of the log of fusion times. Is it better to analyze the...