Questions from Statistics

Q: Results were combined from ten major studies involving a total of more

Results were combined from ten major studies involving a total of more than 1.25 million children. The analysis confirmed that there is no linkage between vaccines and autism (Vaccine, Volume 32, Issu...

Q: An experiment conducted at Pennsylvania State University was designed to evaluate the

An experiment conducted at Pennsylvania State University was designed to evaluate the effectiveness of irrigation and fertilizers on poplar tree growth. Fertilizer is used with one group of poplar tre...

Q: An experiment conducted at Pennsylvania State University was designed to evaluate the

An experiment conducted at Pennsylvania State University was designed to evaluate the effects of irrigation and fertilizers on poplar tree growth. Two different sites were used: (1) rich and moist; (2...

Q: In a comparison of gasoline with different octane ratings, 24 vans

In a comparison of gasoline with different octane ratings, 24 vans are driven with 87 octane gasoline, and 28 sport utility vehicles are driven with 91 octane gasoline. After each vehicle has been dri...

Q: In one of Mendel’s famous genetics experiments that he conducted with peas

In one of Mendel’s famous genetics experiments that he conducted with peas, he obtained a sample of offspring peas consisting of 428 green peas and 152 yellow peas. Based on his theories, he expected...

Q: The Journal of Consumer Research included a report of a study that

The Journal of Consumer Research included a report of a study that was conducted to determine whether people have different spending characteristics when they have a $1 bill or when they have four qua...

Q: In a clinical trial of the effectiveness of a lotion used to

In a clinical trial of the effectiveness of a lotion used to treat tinea pedis (athlete’s foot), the physicians who evaluate the results know which subjects were given the treatment and which were giv...

Q: You want to determine the average (mean) error of aircraft

You want to determine the average (mean) error of aircraft altimeters when they are tested at a simulated altitude of 1000 feet.

Q: In a test of the effects of lifting heavy weights on blood

In a test of the effects of lifting heavy weights on blood pressure, one group undergoes a treatment consisting of a weight-lifting program, while another group lifts tennis balls.

Q: A professional driver is used to compare the handling of Ford Taurus

A professional driver is used to compare the handling of Ford Taurus cars and Porsche 911 cars.