Q: A group of boys is randomly divided into two groups. One
A group of boys is randomly divided into two groups. One group watches violent cartoons for one hour, and the other group watches cartoons without violence for one hour. The boys are then observed to...
See AnswerQ: A local public school encourages, but does not require,
A local public school encourages, but does not require, students to wear uniforms. The principal of the school compares the grade point averages (GPAs) of students at this school who wear uniforms wi...
See AnswerQ: The blog NHS Choices ( February 10, 2014) noted that
The blog NHS Choices ( February 10, 2014) noted that “there has been increasing anecdotal evidence that vitamin C may still be useful as an anticancer medicine if used in high concentrations and given...
See AnswerQ: You can find many testimonials on the Internet that drinking aloe vera
You can find many testimonials on the Internet that drinking aloe vera juice helps with digestive ailments. From these testimonials can we conclude that aloe vera juice causes digestive problems to go...
See AnswerQ: A group of educators want to determine how effective tutoring is in
A group of educators want to determine how effective tutoring is in raising students’ grades in a math class, so they arrange free tutoring for those who want it. Then they compare final exam grades f...
See AnswerQ: A doctor who believes strongly that antidepressants work better than “talk
A doctor who believes strongly that antidepressants work better than “talk therapy” tests depressed patients by treating half of them with antidepressants and the other half with talk therapy. After s...
See AnswerQ: In a 2017 study designed to investigate the effects of exercise on
In a 2017 study designed to investigate the effects of exercise on second language learning, 40 subjects were randomly assigned to one of two conditions: an experimental group that engaged in simultan...
See AnswerQ: A study reported by Griffin et al. compared the rate of
A study reported by Griffin et al. compared the rate of pneumonia between 1997 and 1999 before pneumonia vaccine (PCV7) was introduced and between 2007 and 2009 after pneumonia vaccine was introduced....
See AnswerQ: The New England Journal of Medicine reported on a study of fish
The New England Journal of Medicine reported on a study of fish oil consumption in pregnant mothers and the subsequent development of asthma in their children. Read the excerpts from the abstract and...
See AnswerQ: People who have had strokes are often put on “blood thinners
People who have had strokes are often put on “blood thinners” such as aspirin or Coumadin to help prevent a second stroke. Describe the design of a controlled experiment to determine whether aspirin o...
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