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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

What is the test value for this hypothesis test?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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