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A population is estimated to have a standard deviation of 6. We want to estimate the population mean within 1, with a 99% level of confidence.
How large a sample is required? (Round up your answer to the next whole number.)
before bidding on a contract a contractor wants to be 90 confident that he is in error by less than 20 minutes in
Placing the burden of Medicaid funding on individual States: Unfortunately, there is a correlation between unemployment rates, low wages, drug addiction.
researchers measured the seated systolic blood pressure of 27healthy white males. the resulting publication reports x
a) What is the correlation coefficient & how strong is it? b) What is the best fit regression equation that can predict the MBA GPA from the BS GPA? c) What percent of the variability in the MBA GPA can be explained by the regression model?
The average number of hours of sleep per night that a college freshman gets is 6.50 with a standard deviation of 1.80 hours. If 35 college freshmen are randomly chosen find the probability that they average at least seven hours of sleep per night.
Find a 95% confidence interval for the mean price of all textbooks. Then find a 99% confidence interval and compare your results.
1. compute the percentage of the normal curve located at or above each of the following z values.a. 1.50b. -1.50c.
Consider the ISTEP scores, which are approximately Normal, N(572, 51). How high a score is needed to be in the top 25% of students who take this exam?
A random sample of 100 highway runs of the new model yields a sample mean of 32 miles per gallon. Give a 95% confidence interval for the population average miles-per-gallon highway rating.
What is the real world value of the y-intercept and slope in a regression equation? Other than statistics problems, why should I care?
Suppose that there is a lottery where you select 3 different numbers between 0 and 9. A digit cannot be selected twice so you can select 123 but not 112. How many different three digit numbers are possible
Human populations can be modeled using an exponential growth function. Use the Library for research or other resources to find the following:
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