1) Researchers have found that providing therapy dogs on college campuses near midterms and finals is...

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1) Researchers have found that providing therapy dogs on collegecampuses near midterms and finals is an effective way to reducestudent stress. They wondered if providing other animals would alsoreduce stress. To find out, they brought four different animals tocampus and had students rate their stress level after time spentwith the animal. The results are presented below.
OBSERVED
Dog
Cat
Ferret
Lizard
More Stressed
18
32
38
92
Same Stressed
30
28
42
40
Less Stressed
132
90
40
18
a) Specify the null and alternative hypotheses for a chi-squaretest of independence
B)Fill in the table below with the expected frequencies
EXPECTED
Dog
Cat
Ferret
Lizard
More Stressed
Same Stressed
Less Stressed
c) Use the observed and expected frequencies to calculate achi-square test of independence to detect any relationship betweentype of animal and feelings of stress, using alpha = .01. Reportthe critical value and your decision.
e) Calculate the effect size for the relationship between animaltype and stress level.

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4.0 Ratings (475 Votes)

aClaim There is a relationship between animal type and stresslevelThe null and alternative hypothesis isH0 There is no relationship between animal type and stresslevelH1 There is a relationship between animal See Answer

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OBSERVED		Dog	Cat	Ferret	Lizard
More Stressed	18	32	38	92
Same Stressed	30	28	42	40
Less Stressed	132	90	40	18

EXPECTED	Dog	Cat	Ferret	Lizard
More Stressed
Same Stressed
Less Stressed