APB.044 Evaluate a Null Hypothesis with Chi-Square
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Skill Level🔴 Hard
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A grassland insect survey classifies grasshoppers by color morph. The null hypothesis states that color morphs follow the predicted 6:3:1 green-to-brown-to-striped model. Observed counts are green morph 289; brown morph 107; striped morph 44. Expected counts under the null are green morph 264; brown morph 132; striped morph 44. The calculated chi-square value is 7.10 with 2 degrees of freedom. The critical value is 5.99 at alpha = 0.05 and 9.21 at alpha = 0.01. Which conclusion correctly applies both significance criteria?
