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Suppose we generate a random variable X in the following way. First we ?ip a fair coin. If the coin is heads, take X to have a Unif(0,1) distribution. If the coin is tails, take X to have a Unif(3,4) distribution.
(a) Find the mean of X.
(b) Find the standard deviation of X.
in a particular occupation a random sample of 210 men found that 65 smoked. in a random sample of 240 women 87 smoke.
rochester-electro-medical inc. is a manufacturing company based in tampa florida that produces medical products.
suppose we have three fair 6-sided die one colored green one colored black and one colored red. an experiment consists
locations: Jung (Sweden), Reynosa (Mexico), Pohang (South Korea) and East Tamaki (New Zealand). The electric motors are manufactured by Nanuq Europe which has three plants capable of producing these motors. These plants are located in Gaydon (UK),..
assume that adults have iq scores that are normally distributed with a mean of 100 and a standard deviation of 15. find
A college's data about incoming freshmen indicates that the mean of their high school GPA was 3.4, with a standard deviation of 0.35. Let X=the GPA of an incoming freshman. The students are randomly assigned to writing groups of size 49.
What is the 90% confidence interval estimate of the difference between the two population means? How do the results compare in all the three approaches to hypothesis testing?
each of 12 refrigerators of a certain type have been returned to the distributor because of loud noise. suppose that 7
Identify a business situation where you might want to make an estimate. For example, you might want to estimate the mean dollar amount spent by customers at a retail store.
There are two car dealerships in a particular region. The mean monthly sales at the two dealerships are about the same. Though, one of the dealerships (dealership A) is boasting to corporate headquarters that his dealership's monthly sales are mor..
an ecologist is studying the effects of predation on the behaviour of the common rabbit. during one hours of
If they would like to estimate the true average time to within 1.9 minute (with 95% confidence) what sample size should they use? (remember to round to the next largest integer.)
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