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CRE · Question #327
CRE Question #327: Real Exam Question with Answer & Explanation
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Question
Six independent samples are taken of smokestack gas. The mean value of a critical pollutant was 30.2 ppm for the six samples, with a standard deviation s = 5 ppm. Assuming that the samples were taken at random times, what is the 90% confidence interval for the proportion of the critical pollutant in the smokestack gas?
Options
- A30.2 ?4.11ppm
- B30.2 ?3.96 ppm
- C30.2 ?4.00 ppm
- D30.2 ?3.36 ppm
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