2. A plant physiologist investigated the salt-tolerance properties of three different plant species. Each species was grown in a $0.0 \%$ and $0.3 \%$ salt solution. Seeds were placed in suitable containers and after a given length of time the growth of each plant was determined. Dry weight measurements were made in grams. A section of a greenhouse bench was selected showing uniform lighting and heating conditions. Six containers, each containing one species and treatment, were randomized on this section of the bench. Five replications of the experiment were carried out (done at different times).

1. Write out an expression for a linear model that describes the data.
2. Using SPSS supplemented with any necessary hand-calculations, completely analyze the data. (Hint: Use various SPSS output items such as means, MSE, etc. to perform Multiple Comparisons Tests with a calculator).
3. Interpret the analysis in biological terms.

4. In this study, variation in bristle number in Drosophila persimilis flies was determined. Four traps were sampled in each of three localities in western North America . Bristle counts were performed on five flies per trap. Do bristle counts vary significantly among locations?

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