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Which of the following is the best description of the null hypothesis in this experiment?
Lead exposure can cause many neurological problems in young children. Lead exposure is measured as the lead blood level in micrograms per 100 mL. A study in El Paso Texas wanted to determine if lead blood level varied by distance to a lead-emitting smelter, which was defined as 0-1 miles from the smelter, 1-2.5 miles from the smelter, and 2.5-4 miles from the smelter. Here are the ANOVA results with a 0.05 level of significance. Which of the following statements is true? Df Sum Sq Mean Sq F value Pr(>F) Distance 2 601.518 300.759 3.4974 0.033 Residuals 121 10405.516 85.996
The analysis of variance (ANOVA) tests hypotheses about the population variance.
You report your ANOVA and conclude that there is a statistically significant difference between the three eye-colour groups, F (2, 500) = 7.72, p = .007. Which of the following statements is true?
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