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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" (Journal of the Air Pollution Control Association [1988]: 647-651) 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 36.92 ppb, and the standard deviation was 11.34. Making no assumptions about the shape of the NO2 distribution, what can be said about the percentage of observations between 14.24 and 59.60?
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 24.76 ppb, and the standard deviation was 17.20. Do these values suggest that the histogram of sample observations did not closely resemble a normal curve?
Editors of the business report in Exercise 12 are willing to accept a margin of error of 4% but want 99% confidence. How many randomly selected employers will they need to contact?
We can show that {Y(t),t ≥ 0} is also a birth and death process. (a) Give the birth and death rates of the process {Y(t), t ≥ 0}.
a recent national survey found that high school students watched an average mean of 7.5 dvds per month with a
An article published in Access magazine states that according to a survey conducted by the American Management Association, 78% of major U.S. companies.
If 87 % of people have brown eyes and 4 people selected at random, find the probability that at least one of them has brown eyes
The production line that packages boxes of raisins at a snack food manufacturer will be conisdered operating properly if the average weight of the boxes of raisin is 3.5 ounces with a standard deviation of 0.3 ounces.
You pick three cards at random from a deck. Find the probability of each event described below.- You get no aces.- You get all hearts.
MA3110 - Module Correlation and Regression - Is there sufficient evidence to conclude that there is a linear correlation between the proportion of wins and the above difference?
a television station estimates that 60 of college students watch the super bowl. for a sample of 240 students selected
a random digit dialing telephone survey of 880 drivers asked recalling the last ten traffic lights you drove through
Women in military combat is insane. No society in its right mind would have such a policy. The military needs only young people and that means the only women.
the owner of brittens egg farm wants to estimate the mean number of eggs laid per chicken. a sample of 20 chickens
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