Introductory Statistics
3rd Edition
ISBN: 9780135188927
Author: Gould, Robert, Ryan, Colleen N. (colleen Nooter)
Publisher: Pearson,
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Chapter 12, Problem 42SE
To determine
Determine whether the given conclusion is likely to be a result of an observational study or a controlled experiment. Also, state whether it can be concluded that owning a dog causes a decrease in cardiovascular disease from the study.
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Researchers have observed that high school
students who watched educational television
programs as young children tend to have
higher grades than their peers who did not
watch educational television. Is this an
observational study or a controlled
experiment? Explain why.
Studies have suggested that alcohol abuse and disorders are found to be more prevalent during early adulthood than in any other age group, with about 9% of young adults (age 18 to 29 years) meeting the criteria to be labeled as alcoholic. In addition, surveys have shown that college students tend to drink more than their peers who do not attend college.
You want to test to see if there are differences in excessive alcohol use in young adults that attend college versus those who do not, so you surveyed 405 young adults, age 19 to 22, about their alcohol use by asking the question, "Have you consumed alcohol to the point of intoxication at least once within the past month?" with the following results.
Young Adults Attending College
Young Adults Not Attending College
n1 = 255
n2 = 150
y1 = 96
said "yes"
y2 = 44
said "yes"
p̂1 =
96
255
p̂2 =
44
150
(a)
Calculate the test statistic. (Round your answer to two decimal places.)
(b)
If
H0:…
Is Cognitive Processing Therapy (CPT) more effective in treating PTSD than Prolonged Exposure therapy (PE)? Does this question represent a correlational or experimental research design? Why?
Chapter 12 Solutions
Introductory Statistics
Ch. 12 - Dairy Products and Muscle The following two...Ch. 12 - Coffee and Depression The following two headlines...Ch. 12 - Marijuana Use and Bone Density In a 2017 study...Ch. 12 - Prob. 4SECh. 12 - Prob. 5SECh. 12 - Prob. 6SECh. 12 - Prob. 7SECh. 12 - Smoking Cessation In a 2018 study reported in The...Ch. 12 - Prob. 9SECh. 12 - Prob. 10SE
Ch. 12 - Prob. 11SECh. 12 - Sugary Drinks and Brain Health An April 2017...Ch. 12 - Expression of Feelings A 2017 Pew poll asked a...Ch. 12 - Prob. 14SECh. 12 - Prob. 15SECh. 12 - SAT Prep and Power Suppose an SAT tutoring company...Ch. 12 - Brain Games (Example 2) Researchers are interested...Ch. 12 - A Smile a Day Smiling is a sign of a good mood,...Ch. 12 - Speed Skating Suits (Example 3) Speed skating is a...Ch. 12 - Flu Vaccines and Age Suppose you want to compare...Ch. 12 - Preventing Heart Attacks with Aspirin Suppose that...Ch. 12 - Prob. 22SECh. 12 - Dietary Improvement and Depression In a 2017...Ch. 12 - Prob. 24SECh. 12 - Reading Colored Paper (Example 4) Some people...Ch. 12 - Prob. 26SECh. 12 - Prob. 27SECh. 12 - Prob. 28SECh. 12 - Prob. 29SECh. 12 - Library Audio Books Suppose a college is deciding...Ch. 12 - Prob. 31SECh. 12 - Prob. 32SECh. 12 - Prob. 33SECh. 12 - Prob. 34SECh. 12 - Prob. 35SECh. 12 - Prob. 36SECh. 12 - Prob. 37SECh. 12 - Prob. 38SECh. 12 - Prob. 39SECh. 12 - Prob. 40SECh. 12 - Prob. 41SECh. 12 - Prob. 42SECh. 12 - Prob. 43SECh. 12 - Prob. 44SECh. 12 - Yoga Study Design Refer to exercise 12.43. How...Ch. 12 - Fish Consumption Study Design Refer to exercise...Ch. 12 - Prob. 47SECh. 12 - Prob. 48SECh. 12 - Alumni Donations The alumni office wishes to...Ch. 12 - Prob. 50SECh. 12 - Prob. 51SECh. 12 - Prob. 52SECh. 12 - For exercises 12.51-12.53, evaluate the study...Ch. 12 - Prob. 54SECh. 12 - Anesthesia Care and Adverse Postoperative Outcomes...Ch. 12 - Prob. 56SECh. 12 - Prob. 57SECh. 12 - Prob. 58SE
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