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The results of a recent study regarding smoking and three types of illness are shown below. The illnesses are Emphysema, Heart Problem, and Cancer. Under nonsmokers there were 20 with emphysema, 70 with heart problems and 30 with cancer for a total of 120. Under smoker there were 60 with emphysema, 80 with hear problems and 40 with cancer for a total of 180. The totals for emphysema were 80, for heart problems 150 and for cancer 70 and a grand total of 300 in the study We are interested in determining whether or not illness is independent of smoking.Conduct the appropriate test at an alpha level of 0.05 Columns are Illness--Nonsmoker--Smoker--Totals and the rows are the three illnesses and a total row.
The probability density of the net weight in ounces of a packaged compound is f(x)=2.0 for 19.75
(A) What is the probability that none of the components will fail ??? (B) What is the probability that at least one component will fail ???
Suppose a restaurant business succeeds 60% of the time. Suppose that there are three such restaurants open in your city. When they don't compete with one another, it is reasonable to believe that their relative success would be independent.
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records.
Suppose you manage Tennessee Grilled Pork, a fast food restaurant specializing in pork sandwiches and pork chops on a stick. You have decided to build a new restaurant and have 2 possible site locations
Compute the within group variability. Do you require any post hoc testing? Why or why not? Decribe in detail.
Albert Einstein stated, "The formulation of a problem is far more often essential than its solution, which may be merely a matter of mathematical or experimental skill.
A DVD rental store wants to know what proportions of its customers are under age 21. A simple random sample of 500 customers was taken, and 375 of them were under age 21. Presume that the true population proportion of customers under age 21 is 0.6..
A clinical investigator is interested in understanding the relationship between demographic factors and congestive heart failure, measured by a cardiac index (CI).
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution. Use a =.05 and .01 and perform a goodness of fit test.
Should the finite-population correction factor be used? Why or why not?
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