Business Statistics: A First Course (8th Edition)
8th Edition
ISBN: 9780135177785
Author: David M. Levine, Kathryn A. Szabat, David F. Stephan
Publisher: PEARSON
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Researchers were interested in determining whether gender and/or the number of tours soldiers served affected the incidence of PTSD. The PTSD impact instrument was used and scores were recorded upon discharge.
State the null and alternative hypotheses. Include both interaction and main effect hypotheses (should be 3 null and 3 alternate hypotheses).
Ride services are on the rise, such as Uber and Lyft. You wondered if the recent news reports of crime occurring with these ride services impacted the usage of them, especially with women. You decide to conduct a survey about ride service usage among male and female college students. The results showed that 19 males use ride services and 11 do not. While 12 females use ride services and 18 do not.
Identify an appropriate null hypothesis:
A recent survey asked 1200 randomly selected U.S. adults if they believe that the U.S. federal government is doing enough to keep U.S. elections safe from outside interference. Of the survey participants, 620 were men and 580 were women. The researchers wanted to know if there was a difference in how men and women responded and decided to conduct a hypothesis test. The researchers predict that there is no difference between the proportion of women (p1) and men (p2) who believe that the U.S. federal government is not doing enough to keep elections safe.
Which of the following are the correct null and alternative hypotheses to test this claim?
a. Ho: p1 # p2 and Ha: p1 = p2
b. Ho: p1 = p2 and Ha: p1< p2
c. Ho: p1 > p2 and Ha: p1 # p2
d. Ho: p1 = p2 and Ha: p1 # p2
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