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According to an article in the New York Times, new Internet dating Web sites use sex to advertise their services.
One such site, True.com, reportedly received an average of 3.8 million visitors per month.
Suppose that you want to disprove this claim, believing the actual average is lower, and your random sample of 15 months revealed a sample mean of 2.1 million visits and a standard deviation of 1.2 million. Conduct the test using α = 0.05. What is the approximate p-value?
Implement a syntactic transformation let->combination that reduces evaluating let expressions to evaluating combinations of the type shown above, and add the appropriate clause to eval to handle let expressions
Use MegaStat's output for multiple regression to determine the multiple regression equation
Although Bob raised the price to $1.75, sales of quarter-pound burgers rose to 8,200. Explain why this does not represent a violation of the law of demand.
Find the moment generating function of their sum and identify the corresponding distribution, its mean and its variance.
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 500 and a population standard deviation of 6 and a sample size of 18.
A local health care company wants to estimate the mean weekly elder day care cost. A sample of 10 facilities shows a mean of $250 per week with a standard deviation of $25. What is the 90 percent confidence interval for the population mean?
Nitrogen and Seagrass. The seagrass Thalassia testudinum is an integral part of the Texas coastal ecosystem. Essential to the growth of T. testudinum is ammonium.
let x and y be random variables with joint probability density function pdf given by fxy x y c x y if x 0 y 0 x y 2 0
In a subway station, there are exactly enough customers on the platform to fill three trains. The arrival time of the nth train is X1 + ··· + Xn where X1, X2,... are iid exponential random variables with E[Xi] = 2 minutes.
One of the three vice-presidents has not been invitged to attend any of the last four games. what is the probability that this could happen?
iq scores in a certain population are normally distributed with a mean of 95 and a standard deviation of 13. give your
A coin is biased so that a head is three times as likely to occur as a tail. Find the expected number of tails when this coin is tossed twice.
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