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A corporation randomly selects 150 salespeople and finds that 66% who have never taken a self-improvement course would like such a course. The firm did a similar study 10 years ago in which 60% of a random sample of 160 salespeople wanted a self-improvement course. The groups are assumed to be independent random samples. Let π1 and π2 represent the true proportion of workers who would like to attend a self-improvement course in the recent study and the past study, respectively. Construct a 95% confidence interval estimate of the difference in proportion of workers who would like to attend a self-improvement course in the recent study and the past study. Show how you obtain your answer.
The company tests to determine at the 0.05 level whether the population proportion has changed from the previous study. Which would be the conclusion? Explain how you obtain your answer.
If the sample mean lifetime of the 100 batteries were 36.7 hours. would you find the manufacturer's claim plausible? Explain.
Consider a finite size population for N in which you want to study a variable y that takes a very small value for the first element of the sampling frame
You randomly select six women and ask each if she considers herself a fan of professional baseball. Construct a binomial distribution using n=6 and p=0.39.
What percent of the sales representatives earn more than $42,000 per year? What percent of the sales representatives earn between $32,000 and $42,000?
a random sample of 225 sat scores has a mean of 1500. assume that sat scores have a population standard deviation of
1. The counselor calculates the unbiased estimate of the population's variance to be 15. What is the variance of the distribution of means?
in the new dunn zone at waldo stadium the university has decided to run a promotion to increase student attendance. for
a consignment contains 100 items. if a random sample of 3 items from a consignment contains 1 or more faulty items then
If the purchase price for a tree is po = €30 which she then sells at ps = €50, assuming she cannot recover any value at all from any unsold tree, what is the quantity of trees she should purchase in order to maximize her expected pro..
find the sample size required to estimate the mean age of registered drivers in the united states. assume that we want
The standard deviation of the monthly growth rates will remain 60%. Is the increased investment growth worth the consulting fee?
assume that adults have iq scores that are normally distributed with a mean of u 100 and a standard deviation 20. find
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