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(a) for a representative sample of cars, would the correlation between the age of the car and its gasoline economy (miles per gallon) be positive or negative?
(b) the correlation between gasoline economy and income of owner turns out to be positive. how do you account for this positive association?
If the probability of getting caught is .02, the probability of getting a ticket is .97 and the probabiity of having to pay the ticket is .94, what is the direct cost of running a red light.
it has been conjectured that workplace smoking bans induce smokers to quit by reducing their opportunities to smoke.
In a Sgallop poll of 1012 randomly selected adults, 9% said cloning of humans should be allowed. Use a .05 significance level to the test claim that less than 10% of all adults said that cloning should be allowed.
A television station estimates that 45% of college students watch the Super Bowl. For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch this game?
The cholesterol levels of a population have a normal distribution with a mean of 160 and a standard deviation of 30 how you I find the percentage of the population with cholesterol levels above 200.
At the .05 significance level, is there a difference in the mean number of calls per day between the two employees?
he next 20%, a B; the next 40%, a C; the next 21%, a D; and the bottom 10%, an F. What average must you exceed to receive a grade of C or better?
Brain cancer is a rare disease. In any year there are about 3.1 cases per 100000 od population. Suppose a small medical insurance company has 150000 people on its books.
Area to right of mean of normal probability distribution is?
Make a decision by computing the test statistic and comparing it to the decision rule spelling out in English just what the decision means in terms of the question in the problem.
Determine the probability of examining a sample mean weight from any 20 women chosen from this population that is less than S (your sample mean) by using population standard deviation?
The forecast for the third quarter is 3,000 units; the seasonal index for the quarter is 1.05. What are the seasonally adjusted sales for the quarter?
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