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An exhaustive survey of all users In a wilderness park taken in 1980 revealed that the average number of persons per party was 2.6. In a random sample of 25 parties taken in 2005, the average was 3.2 persons, with a standard deviation of 1.08. Test the hypothesis that the number of persons per party has changed in the intervening years.
a researcher wanted to compare food ratings at restaurants located in the city with those located in the suburbs. she
The lives of many people are affected by a fear that prevents them from flying. The Marist Institute for Public Opinion conducted a poll of 1014 adults
Media Disk, Inc. duplicates over a million 3.5" floppy disks each year by copying masters to stacks of blank disks. The company buys its blank stock from two different suppliers, A and B.
What is the value of the population mean? What is the best estimate of this value? Explain why we need to use the t distribution. What assumption do you need to make?
Can the company conclude that the pill is effective at promoting weight loss? Write the hypotheses and conduct the appropriate hypothesis test.
Five test vehicles of each type were crashed, with the results shown below. Research question: Are the mean crash damages the same for these three vehicles?
What are the strengths and weaknesses of nonparametric tests? Can the outcomes of the nonparametric tests be generalized to populations?
discuss the various sampling methods we might use in determining which items to include in a
during a national debate on changes to health care a cable news service performs an opinion poll of 500 small-business
An analyst wishes to include number of older siblings in family as a predictor variable in a regression analysis of factors affecting maturation in eighth graders.
A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively;
Discuss an element of drinking water where you see a public health gap or need that should be addressed. You may bring up a specific case relevant to your community if you have one, or bring up a global issue.
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