Questions from Business Statistics

Q: A study published in the New England Journal of Medicine (Aug

A study published in the New England Journal of Medicine (Aug. 2001) suggests that it dangerous to enter a hospital on a weekend. During a 10-year period, researchers tracked over 4 million emergency...

Q: A polling organization is checking its database to see if the data

A polling organization is checking its database to see if the data sources it used sampled the same ZIP codes. The variable Datasource=1 if the data source is MetroMedia, 2 if the data source is DataQ...

Q: A research doctor has discovered a new ointment that she believes will

A research doctor has discovered a new ointment that she believes will be more effective than the current medication in the treatment of shingles (a painful skin rash). Eight patients have volunteered...

Q: Hoping to learn how to control crop damage by a certain species

Hoping to learn how to control crop damage by a certain species of beetle, a researcher plans to test two different pesticides in small plots of corn. A few days after application of the chemicals, he...

Q: Can special study courses actually help raise SAT scores? One organization

Can special study courses actually help raise SAT scores? One organization says that the 30 students they tutored achieved an average gain of 60 points when they retook the test. 1. Explain why this d...

Q: An industrial machine requires an emergency shutoff switch that must be designed

An industrial machine requires an emergency shutoff switch that must be designed so that it can be easily operated with either hand. Design an experiment to find out whether workers will be able to de...

Q: A consumer group wants to test the effectiveness of a new organic

A consumer group wants to test the effectiveness of a new organic laundry detergent and make recommendations to customers about how to best use the product. They intentionally stain 30 white T-shirts...

Q: A humor piece published in the British Medical Journal (Parachute Use

A humor piece published in the British Medical Journal (Parachute Use to Prevent Death and Major Trauma Related to Gravitational Challenge: Systematic Review of Randomized Control Trials, Gordon, Smit...

Q: A casino claims that its roulette wheel is truly random. What

A casino claims that its roulette wheel is truly random. What should that claim mean?

Q: The weather reporter on TV makes predictions such as a 25%

The weather reporter on TV makes predictions such as a 25% chance of rain. What do you think is the meaning of such a phrase?