A Field Researcher Is Gathering Data on the Trunk Diameters ${ } ^ { \pm } = .10$

question 27

Multiple Choice

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 ${ } ^ { \pm } = .10$ , that the average trunk diameter of a pine tree is greater than the average diameter of a spruce tree?
$\begin{array}{|l|c|c|}\hline & \text { Pine trees } & \text { Spruce trees } \\\hline \text { Sample size } & 80 & 60 \\\hline \text { Mean trunk diameter }(\mathrm{cm}) & 35 & 33 \\\hline \text { Sample variance } & 130 & 150 \\\hline\end{array}$

• A) The data do not support the claim because the test value 0.48 is less than 1.28.
• B) The data do not support the claim because the test value 0.98 is less than 1.28.
• C) The data do not support the claim because the test value 0.98 is less than 1.64.
• D) The data do not support the claim because the test value 0.48 is less than 1.64.

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