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An advertising executive wants to estimate the mean amount of time that consumers spend with digital media daily. From past studies, the standard deviation is estimated as 49 minutes. What sample size is needed if the executive wants to be 95% confident of being correct to within ±4 minutes?
If X and Yare independent Poisson random variables, show that the conditional distribution of X, given X + Y, is binomial.
in exponential smoothing models the value of the smoothing constant may be any number between .a -1 and 1b -5 and 5c 0
The width of a confidence interval will be:
A town s January high temperatures average 36° F with a standard deviation of 10°, while in July the mean high temperature 74° is and the standard deviation is 8°. In which month is it more unusual to have a day with a high temperature of 55°? Exp..
Based on a level of significance of a = .01, test the hypothesis.
Calculate the value of Pearson correlation. Illustrate what information is provided by the numerical value of the Pearson correlation.
An ABC news program reported that a standard method for rendering patients unconscious led patients to wake up during surgery.- Verify that a .95 confidence interval for p, the probability of waking up, is (0, .000015).
Could you explain the process, formula clearly instead of using excel and financial calculator?
Find some values of z. Find the value z of a standard Normal variable Z that satisfies each of the following conditions. (If you use Table A, report
Describe the advantages and disadvantages of quasi-experiments? What is the fundamental weakness of a quasi-experimental design? Why is it a weakness? Does its weakness always matter?
a) In the context of the problem, which of the following interpretations is correct, if any? A. We're 95% confident that the mean length of eggs for the New Zealand bird population is between 38 mm and 53 mm. B. 95% of all birds in New Zealand have e..
However, the mean ounces of ?ll μ may change from day to day, because of change of operator or adjustments in the machine. If n = 55 observations on ounces of ?ll are taken on a given day, ?nd the probability that the sample mean will be within 0...
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