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The serum cholesterol levels for men in one age group are normally distributed with a mean of 185.1 and a standard deviation of 37.8. All units are in mg/100 ml. Find the two levels that separate the top 8% and the bottom 8% of this population.
How do research questions frame studies? What type of wording would lead to a qualitative study? A quantitative one?
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary ..
Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 8 at the 0.05 level of significance?
Finds that their mean travel time is = 22.5 minutes. What are the null and alternative hypotheses for testing whether the true mean is different from 20 minutes?
There is some concern that exposure to gases used in anesthesiology might be harming health of anesthesiologists. In one study of 525 Michigan nurse anesthesiologists, 10 reported a new malignancy other than skin cancer during the previous year.
In 2004, Newsmonth reported that 60% of young children have blood lead levels that could impair their neurological development. Assuming that a class in a school is a random sample from the population of all children at risk
For the following ANOVA experiments, determine the critical region(s) and critical value(s) that are used in the classical approach for testing the null hypothesis
When 343 college students are randomly selected and surveyed it is found that 110 own a car. find a 99% confidence level for the true population of all college students who own a car.
What is the idea of "least squares"? What is the connection between "least squares" and linear regression?
On page 336 of the text we are given a formula to calculate the minimum necessary sample size n. When we do not know the estimates p hat and q hat, we are told to use a value of 0.5 for each of them. Why?
Poisson random variable with a mean rate of 8 messages per hour. What is the probability that fewer than three messages are received in one-half hour?
Describe a business situation where you would want to use a t-test. Why would you choose that test? What would you expect to show by doing this?
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