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The Environmental Protection Agency (EPA) has established national ambient air quality standards in an effort to control air pollution. Currently, the EPA limit on ozone levels in air is 12 parts per hundred million (pphm). A study examined the long-term trend in daily ozone levels in Houston, Texas. One of the variables of interest is Y, the number of days in a year on which the ozone level exceeds the EPA 12 pphm threshold. The mean number of exceedances in a year is estimated to be 18. Assume appropriate probability distribution for Y and provide logical reasoning behind your assumption.
on saturdays cars arrive at sami schmitts scrub and shine car wash at the rate of 6 cars per fifteen-minute interval.
Corporation has 2000 male and 500 female engineers. Stratified random sample of 200 male and 50 female engineers provides each engineer. How is the stratified sample different from the SRS?
Suppose that you work for a newly restructured automotive company with nearly 100,000 employees. You are in charge of purchasing engines from an overseas supplier. Company policy is that you purchase several hundred engines each month to be placed in..
the distribution of the amount of money in savings accounts for university of miami students has an average of 1100
It has been evaluated that 30% of all farms are family-owned. In sample of 12 farms, determine the probability that exactly 3 farms are family owned?
Consider the relationship between yearly wine consumption (litres of alcohol from drinking wine per person) and yearly deaths from heart disease (deaths per 100,000 people) in 19 developed countries.
A statistics professor receives an average of five e-mail messages per day from students. Assume the number of messages approximates a Poisson distribution. What is the probability that on a randomly selected day she will have no messages?
Does the regression equation account for a significant portion of the variance in GPA? Use ∝ = .05 to evaluate the F - ratio.
given a one independent variable linear equation that states cost in k and given the following information calculate
When studying the simultaneous responses to two categorical questions, we should set up a:
according to a 2003 national household survey on drug use and health 263 out of 1546 randomly selected americans
Does this sample give sufficient evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of general population? Use two-tailed test with α = .01.
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