Answer Happy

An article describes an experiment to determine the effectiveness of mushroom compost in removing petroleum contaminants from soll. Out of 140 seeds planted in soil containing 3% mushroom compost by weight, 74 germinated. Out of 140 seeds planted in soil containing 5% mushroom compost by weight, 86 germinated. Let ex represents the population proportion of seeds germinated in soil containing 5% mushroom compost by weight and let pyrepresents the population proportion of seeds germinated in soil containing 3% mushroom compost by weight. Find a 95% confidence interval for the difference px-py between the proportions of seeds that germinate. (Round the final answers to four decimal places.) The 95% confidence interval is (0.2012100. 0.029781