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A study of more than 50,000 U.S. nurses found that those who drank just one soda or fruit punch a day tended to gain much more weight and had an 80% increased risk of developing diabetes compared to those who drank less than one a month. (The Washington Post, August 25, 2004). "The message is clear. . . . Anyone who cares about their health or the health of their family would not consume these beverages," said Walter Willett of the Harvard School of Public Health, who helped conduct the study. The sugar and beverage industries said that the study was fundamentally flawed. "These allegations are inflammatory. Women who drink a lot of soda may simply have generally unhealthy lifestyles," said Richard Adamson of the American Beverage Association.
a. Do you think that the study described was an observational study or an experiment?
b. Is it reasonable to conclude that drinking soda or fruit punch causes the observed increased risk of diabetes? Why or why not?
Why don't researchers who want to test hypotheses about the relationships between variables worry a great deal about random sampling?
Personnel tests are designed to test a job? applicant's cognitive? and/or physical abilities. A particular dexterity test is administered nationwide.
the rent-n-drive car rental company know from experience that the number of miles per day that customers drive a rental
The mean hourly wage of bottling plant employees in Nelson County is $16.50 per hour. What is the likelihood that we could select a sample of 40 bottlers with a mean of $16.75 or more? The standard deviation of the sample is $1.75
he probability is 1 in 4000000 that a single auto trip in the united states will result in a fatality. over a lifetime
I. Monthly Microsoft stock prices (MSFT) prices from Yahoo Finance at htto://www.whoo.com/finance. Monthly S&P 500 Index (405PC) from Yah00 Finance.
imagine you are a manager at a major bottling company. customers have begun to complain that the bottles of the brand
A random sample of 113 felons convicted of nonviolent crimes in a state prison system completed a program designed to improve their education.
Compute the 95% margins of error for the difference in the two proportions for n = 40, 50, 80, 100, 400, 500, and 1000
for a distribution of scores x40 corresponds to a z-score of z -1.00 and x 42 corresponds to a z-score of z -.50. what
Jim has weighted GPA of 3.84. His high school GPA's are normally distributed with a mean of 2.9 and a standard deviation of 0.5. Kim's high school uses unweighted GPA's and she has a GPA of 3.57. GPA's are also normally distributed in her high sch..
When compared with the uncompensated system (that is, Gc(s) = 1), the compensated system utilizing the lag compensator: Increases the phase lag near the cross-over frequency.
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