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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?
Suppose you're testing H0 : p = 0.62 against Ha : p is not equal to 0.62 and you have calculated the test statistic to be z = 1.334. The area to the right of z = 1.334 (under the standard normal density curve) is 0.091. What is the P-value of your..
For random variables X and Y, we wish to use Y to estimate X. However, our estimate must be of the form = aY (a) Find a∗, the value of a that minimizes the mean square error e = E[(X - aY)2]
forty percent of patrons at jays gym purchase year-long memberships and the rest purchase month-by-month memberships.
Determine the Periodic Deposit and how much of the financial goal comes from deposits and how much comes from interest?
The freshman 15 refers to the urban legend that is the common belief that students gain an average of 15 lb during freshman year. The weights of 100 freshmen at a certain university were observed in August and then in May. The claim that the mean ..
What is the probability there will be between 10 and 14 calls inclusive arriving at the company in the next 15 minutes?
A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3.
(Dealing with Infeasibility) Consider the -relaxation algorithm applied to a minimum cost flow problem with initial prices p0
The following data are the median returns on investment, in percent, for 10 industries.- Find the median of these medians and their mean.
(a) Describe the sample space ?. (b) What is the probability that three tosses will be required?
During the war with Iraq in 1991 the Terraco Motor Company produced a lightweight, all terrain vehicle code named "J99 Terra" for the military. The company is now planning to sell the Terra to the public.
Suppose you went to the Bureau of Labor Statistics web site and found several predictors of your salary. State three possible predictors and a simulated multilinear regression equation along with their p-values.
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