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In a Chance magazine article (Summer 2005), Danielle Vasilescu and Howard Wainer used data from the United Nations Center for Human Settlements to investigate aspects of living conditions for several countries. Among the variables they looked at were the country s per capita gross domestic product (GDP, in $) and Crowdedness, defined as the average number of persons per room living in homes there. This scatterplot displays these data for 56 countries:
a) Explain why you should re-express these data before trying to fit a model.
b) What re-expression of GDP would you try as a starting point?
suppose that we have a sample space s e1 e2 e3 e4 e5 e6 e7 where e1 e2 . . . e7 denote the sample points. the
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Assume a factory manager wishes to buy machines to perform a certain task in a production process. Certain key parts are produced by these machines.
Find the value of z such that approximately 47.93% of the distribution lies between it and the mean.
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He then raised 10 to the power of the endpoints of the interval to get back to dollars. He claims that this is a 95% confidence interval for mean sales. What do you think?
What is the best estimate of the average obesity percentage for these countries? What is the standard deviation for the listedobesity rates?
According to a recent survey, 275 of 400 middle-aged Americans said they used the Internet regularly. 140 of 400 senior citizens said they used the Internet regularly.
You are required to identify the measures of location and dispersion as well as organise the appropriate output from your software into a relevant statistical and graphical presentation of the data. Justify your choices. What are your preliminary ..
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