Question: 5. I am testing a hypothesis that the air quality in Dallas is better than in Fort Worth. I collect 20 samples from each city

5. I am testing a hypothesis that the air quality in Dallas is better than in Fort Worth. I collect 20 samples from each city and measure the level of contaminants in each sample, then use these to compute two sample means: 17.1 ppb for Dallas and 18.2 ppb for Fort Worth. If I know the contaminants levels are normally distributed in each city, and the population variance for Dallas is 2.3 ppb^2 and for Fort Worth the population variance is 1.7 ppb^2, what is a 95% upper-confidence bound for the difference in the population means (M1 - M2)? a. -0.2235 b. -0.3643 C. -0.4823 d. -0.2775

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