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    Samplings of Pine Trees and Spruce Trees

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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 .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 does not support the claim because the test value 1.29 is greater than 1.28.
    B. The data supports the claim because the test value 2.78 is greater than 1.28.
    C. The data supports the claim because the test value 2.78 is greater than 1.64.
    D. The data does not support the claim because the test value 1.29 is less than 1.64.

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    https://brainmass.com/statistics/hypothesis-testing/testing-difference-between-2-means-2-variances-and-2-proportions-correlation-and-regression-225979

    Solution Preview

    Your test statistics value will be 2.78. Your null hypothesis: Average of Pine Trees minus average ...

    Solution Summary

    The trunk diameters between pine trees and spruce trees are compared.

    $2.49

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