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Heart rate during laughter. Laughter is often called ‘‘the best medicine,'' since studies have shown that laughter can reduce muscle tension and increase oxygenation of the blood. In the International Journal of Obesity (January 2007), researchers at Vanderbilt University investigated the physiological changes that accompany laughter. Ninety subjects (18-34 years old) watched film clips designed to evoke laughter.
During the laughing period, the researchers measured the heart rate (beats per minute) of each subject with the following summary results: y‾= 73.5, s = 6. It is well known that the mean resting heart rate of adults is 71 beats/minute.
At α = .05, is there sufficient evidence to indicate that the true mean heart rate during laughter exceeds 71 beats/minute?
Explain in your own words (no direct quotes, please) what it means when there is an interaction between two factors.
Researchers want to measure the effect of alcohol on the development of the hippocampal region in adolescents. The researchers randomly selected 11 adolescents with alcohol use disorders. They wanted to determine whether the hippocampal volumes in..
an anatomy teacher hypothesizes that the final grades in her class are distributed as 10 as 23 bs 45 cs 14 ds and 8 fs.
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The amount of time spent per week in studying STA 392 is of interest. A random sample of 15 students are recorded: (in hours)
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SMALL BUSINESS DILEMMA Ensuring Payment for Products Exported by the Sports Exports CompanyThe Sports Exports Company produces footballs and exports them to a distributor in the United Kingdom.
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Estimate is too low for households in British Columbia. Can the value 0.64 be rejected if a survey of 490 homes in BC yields 331 with one or more lawn mowers?
Explain why it is not appropriate to generalize these results to all drivers, or even to all drivers who visit cnn.com. What is the problem with this method of data collection? Is the variable in this study quantitative or categorical?
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