The experimental data that the student should collect in order to eventually test the hypothesis is; The solar Panel shade and the creosote bush.
Experimental data are usually collected carefully by the researcher to produce and measure change or to create differences when a variable is changed. Thus experimental data helps the researcher to find a causal relationship and could be used to represent a larger population.
Now, in this question what needs to be tested is the effect of the solar panels shade on the mortality of creosote bush. Thus, the experimental data here should be the solar panels shade and the creosote bush
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