Question

Mobile homes are tightly constructed for energy conservation. This can lead to a buildup of indoor pollutants. The paper "A Survey of Nitrogen Dioxide Levels Inside Mobile Homes" discussed various aspects of NO2 concentration in these structures (a) In one sample of mobile homes in the Los Angeles area, the mean NO2 concentration in kitchens during the summer was 38.66 ppb, and the standard deviation was 11.16. Making no assumptions about the shape of the NO2 distribution, what can be said about the percentage of observations between 16.34 and 60.98? (Round the answer to the nearest whole number.) At least 97 x% (b) Inside what interval is it guaranteed that at least 89% of the concentration observations will lie? (c) In a sample of non-Los Angeles mobile homes, the average kitchen NO2 concentration during the winter was 22.36 ppb, and the standard deviation was 16.00. Do these values suggest that the histogram of sample observations did not diosely resemble a normal curve? (Hint: What is x 2s? ○Yes N。

Answer 1

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