Chapter 11: Problem 45
The article "Fish Oil Staves Off Schizophrenia" (USA Today, February 2,
Short Answer
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Chapter 11: Problem 45
The article "Fish Oil Staves Off Schizophrenia" (USA Today, February 2,
These are the key concepts you need to understand to accurately answer the question.
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Get started for freeThe paper "The Observed Effects of Teenage Passengers on the Risky Driving
Behavior of Teenage Drivers" (Accident Analysis and Prevention [2005]:
973-982) investigated the driving behavior of teenagers by observing their
vehicles as they left a high school parking lot and then again at a site
approximately
The paper "Effects of Fast-Food Consumption on Energy Intake and Diet Quality
Among Children in a National Household Survey" ( Pediatrics [2004]: 112 118 )
investigated the effect of fast-food consumption on other dietary variables.
For a sample of 663 teens who reported that they did not eat fast food during
a typical day, the mean daily calorie intake was 2258 and the sample standard
deviation was
Common Sense Media surveyed 1000 teens and 1000 parents of teens to learn
about how teens are using social networking sites such as Facebook and MySpace
("Teens Show, Tell Too Much Online," San Francisco Chronicle, August 10,2009
). The two samples were independently selected and were chosen in a way that
makes it reasonable to regard them as representative of American teens and
parents of American teens.
a. When asked if they check their online social networking sites more than 10
times a day, 220 of the teens surveyed said yes. When parents of teens were
asked if their teen checked his or her site more than 10 times a day, 40 said
yes. Use a significance level of .01 to carry out a hypothesis test to
determine if there is convincing evidence that the proportion of all parents
who think their teen checks a social networking site more than 10 times a day
is less than the proportion of all teens who report that they check more than
10 times a day.
b. The article also reported that 390 of the teens surveyed said they had
posted something on their networking site that they later regretted. Would you
use the two-sample
The director of the Kaiser Family Foundation's Program for the Study of
Entertainment Media and Health said, "It's not just teenagers who are wired up
and tuned in, its babies in diapers as well." A study by Kaiser Foundation
provided one of the first looks at media use among the very youngest children
The following quote is from the article "Canadians Are Healthier Than We Are"
(Associated Press, May 31,2006 ): "The Americans also reported more heart
disease and major depression, but those differences were too small to be
statistically significant." This statement was based on the responses of a
sample of 5183 Americans and a sample of 3505 Canadians. The proportion of
Canadians who reported major depression was given as .082 .
a. Assuming that the researchers used a one-sided test with a significance
level of
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