Questions from Business Statistics

Q: Medical researchers followed 1435 middle-aged men for a period of

Medical researchers followed 1435 middle-aged men for a period of 5 years, measuring the amount of Baldness present (none=1,little=2,some=3,much=4,extreme=5) and presence of Heart Disease (No=0,Yes=1)...

Q: An experiment showed that subjects fed the DASH diet were able to

An experiment showed that subjects fed the DASH diet were able to lower their blood pressure by an average of 6.7 points compared to a group fed a control diet. All meals were prepared by dieticians....

Q: Will listening to a Mozart piano sonata make you smarter? In

Will listening to a Mozart piano sonata make you smarter? In a study published in the journal Psychological Science, Rauscher, Shaw, and Ky reported that when students were given a spatial reasoning s...

Q: Contrast bath treatments use the immersion of an injured limb alternately in

Contrast bath treatments use the immersion of an injured limb alternately in water of two contrasting temperatures. Those who use the method claim that it can reduce swelling. Researchers compared thr...

Q: A Danish study published in the Archives of Internal Medicine casts significant

A Danish study published in the Archives of Internal Medicine casts significant doubt on suggestions that adults who drink wine have higher levels of good cholesterol and fewer heart attacks. These re...

Q: Recently, a group of adults who swim regularly for exercise were

Recently, a group of adults who swim regularly for exercise were evaluated for depression. It turned out that these swimmers were less likely to be depressed than the general population. The researche...

Q: Before drilling for water, many rural homeowners hire a dowser (

Before drilling for water, many rural homeowners hire a dowser (a person who claims to be able to sense the presence of underground water using a forked stick). Suppose we wish to set up an experiment...

Q: A medical researcher suspects that giving post-surgical patients large doses

A medical researcher suspects that giving post-surgical patients large doses of vitamin E will speed their recovery times by helping their incisions heal more quickly. Design an experiment to test thi...

Q: Some schools teach reading using phonics (the sounds made by letters

Some schools teach reading using phonics (the sounds made by letters) and others using whole language (word recognition). Suppose a school district wants to know which method works better. Suggest a d...

Q: Do cars get better gas mileage with premium instead of regular unleaded

Do cars get better gas mileage with premium instead of regular unleaded gasoline? It might be possible to test some engines in a laboratory, but we’d rather use real cars and real drivers in real day-...