The average trunk diameter of a pine tree

Reference no: EM1321246

Question: A field researcher is gathering data on the trunk diameters of mature pine & spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the .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	40	70
Mean trunk diameter (cm)	45	39
Sample variance	100	150

[A] The data supports the claim because the test value 2.78 is greater than 1.64.

[B] The data does not support the claim because the test value 1.29 is less than 1.64.

[C] The data does not support the claim because the test value 1.29 is greater than 1.28.

[D] The data supports the claim because the test value 2.78 is greater than 1.28.

Reference no: EM1321246

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