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2 weeks ago
Scrubbers A factory recently installed new pollution control equipment ("scrubbers") on its smokestacks in hopes of reducing air pollution levels at a nearby national park. Randomly timed measurements of sulfate levels (in micrograms per cubic meter) were taken before (Set C1) and after (Set C2) the installation. We believe that measurements of sulfate levels are normally distributed. Write a complete conclusion about the effectiveness of these scrubbers based on the statistical software printout shown below.
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Stats: Modeling the World


Edition: 4th
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Posts: 269
2 weeks ago
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P < 0.05 is strong evidence that the scrubbers have changed the mean pollution level. We are 95% confident that the mean sulfate level has decreased between 1.20 and 5.38 micrograms per cubic meter.
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