SOLUTION: A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclu
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Question 1000225: A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the 0.10 level of significance, that the average trunk diameter of a pine tree is greater than the average diameter of a spruce tree?
Pine trees
Spruce trees
Sample size
20
30
Mean trunk diameter (cm)
45
39
Sample variance
100
150
You can put this solution on YOUR website! Ho same
Ha pine >spruce
alpha=0.10
one tailed 2-sample test
t with df=48
t=difference in means-0/sqrt (s1^2/n1)+(s2^2/n2))
on calculator get t=1.90, p-0.032
This is significantly different and reject Ho.
