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Question: 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.15 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?
Twins. There is some indication in medical literature that doctors may have become more aggressive in inducing labor or doing preterm cesarean sections.
If the process is in control at the present values of its parameters, what proportion of the output will be nonconforming, assuming a normal distribution of the characteristic?
1. If 8.78 g of CuNO3 is dissolved in water to make a 0.630 M solution, what is the volume of the solution? 2. How many milliliters of 11.5 M HCl(aq) are needed to prepare 520.0 mL of 1.00 M HCl(aq)?
The latter is a random variable (any function of a random variable is a random variable). So what"s the corresponding fact about conditional expectation?
where the number in parentheses is the standard error of the slope estimate. The sample size used is n = 18. Is there evidence of a linear relationship between returns and book to market value?
With regard to the standard deviation, illustrate how and why the larger the deviation number, the more difficult it would be to predict an outcome. Use specific examples to illustrate.
In a 1993 survey of 560 college students, 171 said that they used illegal drugs during the previous year. In a recent survey of 720 college students, 263 said that they used illegal drugs during previous year.
(a) What is the probability distribution of X? Specify any relevant parameter values. (b) What is the probability that at most one of the eight tablets will be defective? (ANSWERS WITH AN EXPLANATION PLEASE)
What is meant by consistency and Draw a figure of the sampling distribution of a consistent estimator.
If you assume returns follow a normal distribution, which investment would give a better chance of getting at least a $40 million return? Explain how your answer could change if you knew returns followed a skewed distribution instead of a normal d..
What is a "Chi-Squared Test"? Provide a fully referenced explanation and provide a brief example on a Chi-squared test, fully referencing all sources of information.
a man recorded the leading digits of the sizes of files stored on his computer. they have frequencies of 45 32 18 12 9
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