EBK BUSINESS STATISTICS
7th Edition
ISBN: 8220102743984
Author: STEPHAN
Publisher: PEARSON
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As a result of dog breeding for certain physical traits, many dog breeds have changed in the last 100 years. A dog breeder wants to measure the effects of breeding on the face length of the boxer breed using a hypothesis test. Suppose that the dog breeder has face length measurements (in inches) from a random sample of 40 female boxer dogs taken in 1915 and a random sample of 40 female boxer dogs taken in 2015.
Which type of hypothesis test should the breeder use?
Reference: Elegans, C. 100 Years of Breed Improvement. 2012. Dog Behavior Science. Retrieved from: https://dogbehaviorscience.wordpress.com/2012/09/29/100-years-of-breed-improvement
Test for one population proportion
Test for one population mean
Test for a difference in two population proportions
Test for a difference in two population means
Do sports drinks help prevent cramps in endurance sports? At the end of a marathon, officials will ask runners if they drank water or a sports drink during the race, along with whether or not they suffered any cramps. Is this an observational study or experiment?
Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 43 of the 49 subjects treated with echinacea developed rhinovirus infections. In a placebo group,76 of the 93 subjects developed rhinovirus infections. Use a 0.05significance level to test the claim that echinacea has an effect on rhinovirus infections.
a. Test the claim using a hypothesis test.
Consider the first sample to be the sample of subjects treated with echinacea and the second sample to be the sample of subjects treated with a placebo. What are the null and alternative hypotheses for the hypothesis test?
A.
H0:
p1≤p2
H1:
p1≠p2
B.
H0:
p1=p2
H1:
p1<p2
C.
H0:
p1=p2
H1:
p1≠p2
D.
H0:
p1≥p2
H1:
p1≠p2
E.
H0:
p1=p2
H1:
p1>p2
F.
H0:
p1≠p2
H1:
p1=p2
Identify the test statisti
z =
(Round to two decimal places as needed.)
What is the conclusion based on the hypothesis test?
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