A field researcher is gathering data on the trunk diameters of mature pine

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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?

Test value:   Round your answer to three decimal places.

What is the critical value?

Critical value:   Round your answer to three decimal places.