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Choosing a Test and Naming the Population(s)
In each case, choose whether the appropriate test is a one-proportion z-test or a two-proportion z-test. Name the population(s).
a. A person is observed to check whether he or she can predict the results of the die roll better than chance alone.
b. A researcher wants to know whether a new skin cream effectively reduces skin rashes compared to an old cream.
c. A survey agency conducts a survey in a city to find out whether the residents like dark and white chocolate equally.
d. A news agency takes a random sample of all corporate professionals to see whether more than 50% approve of the new tax regime.
e. A teacher takes a random sample of students in statistics class to find out whether girls or boys are more likely to remember the conditions for applying z-test.
Most lightbulb manufacturing companies claim that their 60-watt bulbs have an average life of 1000 hours. A skeptic with some skill as an electrician wired up.
the beer institue conducted a study with looking at beer purcheses per capita across states. some states buy more beer
Identify the population and the sample and the variable of interest: The Gallup Organization contacts 1019 adult residents of the United States aged 18 or older and asks whether the events of September 11, 2001 were a life-altering experience
Prove that if Romeo and Juliet are matched to each other under both the men's courtship and the women's courtship algorithms, then they are matched to each other under any stable matching.
a large population is known to have a mean of 11500 and a standard deviation of 2750. if all possible samples of size
a horse race has 12 entries and one person owns 3 of those horses. assuming that there are no ties what is the
the image of the public library is constantly changing and their online services continue to grow. usage of the
a. What is the average vehicle size assuming each vehicle is filled to capacity?
A survey of 500 internet users found that the users were online an average of 6.5 hours a week with a standard deviation of 3.1 hours. If 49 internet users are randomly selected what is the probability that their average time online will be more t..
samples of three materials under consideration for the housing of machinery on a seagoing vessel are tested by means of
an elevator in a building starts with 6 people and stops at 8 floors. assuming that all permutations of the passengers
A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients.
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