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Compute ci for true mean level of ultrafine particles

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Reference no: EM131748126

Question: Is the concentration of ultrafine particles dangerous? In Kansas City, Missouri, suppose fifteen 24-hour periods are selected at random and the concentration of ultrafine particles is carefully measured over each period. The summary statistics are x¯ = 10.76 mg/m3 and s = 4.7 μg/m3 .

a. Find a 95% confidence interval for the true mean level of ultrafine particles in a 24-hour period in Kansas City.

b. Is there any evidence to suggest that the mean level of ultrafine particles in a 24-hour period in Kansas City is over the EPA standard of 35 μg/m3?

Reference no: EM131748126

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