On the morning of March 5, 1996, a train with 14 tankers of propane derailed nea
ID: 3176498 • Letter: O
Question
On the morning of March 5, 1996, a train with 14 tankers of propane derailed near the center of the small Wisconsin town of Weyauwega. Six of the tankers were ruptured and burning when the 1700 residents were ordered to evacuate the town. Researchers study disasters like this so that effective relief efforts can be designed for future disasters. About half of the households with pets did not evacuate all of their pets. A study conducted after the derailment focused on problems associated with retrieval of the pets after the evacuation and characteristics of the pet owners. One of the scales measured "commitment to adult animals," and the people who evacuated all or some of their pets were compared with those who did not evacuate any of their pets. Higher scores indicate that the pet owner is more likely to take actions that benefit the pet. Here are the data summaries.
Group n x s
Evacuated all or some pets 112 7.86 3.69
Did not evacuate any pets 123 6.33 3.56
Analyze the data and prepare a short report describing the results. (Use = 0.01. Round your value for t to three decimal places and your P-value to four decimal places.)
t =
P-value =
Explanation / Answer
from above std error =(S12/n1 +S22/n2)1/2=0.4739
hence test stat t=( x1-x)/std error =3.2283
hence p value =0.0006 for one tailed test
and p value =0.0012 for 2 tailed test
S1 3.690 S2 3.560 n1 112 n2 123 X1 7.860 X2 6.330Related Questions
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