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Question: An Environmental Protection Agency official asserts that more than 80% of the plants in the northeast region of the United States meet air pollution standards. An antipollution advocate is not convinced by the EPA's claim. She takes a random sample of 64 plants in the northeast region and finds that 56 meet the federal government's pollution standards.
a. Does the sample information support the EPA's claim at the 5% level of significance?
b. For which values of the sample proportion (based on a sample size of 64) would the sample data support the EPA's claim, using a 5% significance level?
c. Would the conclusion found in part a change if the sample proportion remained constant but the sample size increased to 124? Explain why or why not.
Compute the value of t. What is your decision regarding the null hypothesis?
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the weight of each client at a weight -loss clinic is measured. the variable is a cannot determine b
The gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard deviation of 16 days.If a gestation period is 276 days, what percentile among human births is this?
A researcher used stepwise regression to create regression models to predict BirthRate (births per 1,000) using five predictors: LifeExp (life expectancy in years), InfMort (infant mortality rate).
Suppose that the probability is 1 in 3,900,000 that a single auto trip in the U.S. would result in the death of the driver. Over a lifetime, an average U.S. driver takes 50,000 trips.
A random sample of n = 4 scores is chosen from the population with µ = 80 and σ = 20. On average, how much difference would you expect between sample mean and population mean?
Of all 3 to 5 year old children, 56% are enrolled in school. A sample of 500 children age 3 to 5 year old is ramndom selected. Find the probability that at least 250 children are enrolled in school.
Researchers conducted an experiment to measure the effect of a drug on improving the quality of sleep as determined by how many more minutes of REM sleep were measured for each participant.
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We will select a random sample of 8 cigarettes and conduct a hypothesis test at the 10 % level of significance to determine whether the true mean nicotine content of all cigarettes differs from 8.4 mg.
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