Insect Behavioral Choice Bioassays: In behavioral assays (such as Y-tube olfactometers, four-arm olfactometers, Petri dish arena choice tests, and oviposition preference experiments), insects make categorical choices among discrete alternatives (e.g., Treatment vs. Control; Plant A vs. Plant B).
Statistical Appropriateness:
The resulting data are frequencies (counts) of individuals selecting each alternative.
The Chi-squared ($\chi^2$) test for independence (or $\chi^2$ goodness-of-fit test) tests the null hypothesis that distribution across choices occurs by chance alone ($50:50$ expected probability):
$$\chi^2 = \sum \frac{(O - E)^2}{E}$$
Where $O$ is observed count and $E$ is expected count under random choice.
Correct Option: Option 4 ($\chi^2$ (chi-squared) test for independence).
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