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Public Policy and Political Science Senator Marco Rubio of Florida is unsure of his vote on an emotional and controversial issue. Before he votes, he would like to know what his constituents think about the proposed bill. An aide for the senator selects 500 people from Florida and asks them whether they believe the bill should become law. Describe the population and the sample in this problem.
A bus company claims that the mean waiting time for a bus during rush hour in less than 7 minutes. A random sample of 20 waiting times has a mean of 5.2 minutes with a standard deviation of 2.1 minutes.
Teaching Sociology (July 1995) developed a model for i the professional socialization of graduate students working toward their doctorate. One of the dependent variables modeled was professional confidence.
Mrs. Ming invested an amount of money in two accounts for one year. She invested some at 8% interest and the rest at 6% interest. Her total amount invested was $1500.
dilbert decides he needs a new job. he begins working at a computer repair store fixing laptops desktop computers and
Researchers at the University of Toronto conducted a series of experiments to investigate whether a commercially sold pet food could serve as a substitute diet for baby snow geese (Journal of Applied Ecology,Vol.32. 1995).
The sodium concentration in whole blood (mEq/L) was determined for two samples of eels. For n = 20 marine eel, s = 40.5; while for n = 20 freshwater eels, s = 32.1.
hours of television watched per day is 1.6 and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a sampling distribution. What is the shape of this sampling distribution? Why?
Specify the type (categorical, ordinal, quantitative) for each of the following variables recorded in a survey of telephone usage in student households:- Telephone exchange (first three numbers after area code).
If X1 and X2 are independent random variables having exponential densities with the parameters a and b the probability density of Y = X1+ X2 when a not eqal to b
For the Japanese female face, y¯ = 10.2% and s = 31.3%. The researchers used this sample information to test the null hypothesis of a mean level.
They are thinking of introducing a new flavor, maplemarshmallow Frumpies, and want to know whether children will prefer the new flavor to the old one. Design a completely randomized experiment to investigate this question.
What are some typical applications of the Binomial and the Poisson probability distribution? Explain with examples. When is the Hypergeometric distribution used?
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