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A researcher wishes to estimate the proportion of adults who have? high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.05 with 99% confidence if
(a) she uses a previous estimate of 0.28??
?(b) she does not use any prior? estimates?
Imagine that you are one of their interviewers, trying to follow these instructions. Whom would you ask? Now explain why you think these polls failed to predict the true winner and why quota sampling is not a good method.
If you were to accept the null hypothesis, even though the null hypothesis was false, what type of error would you have commited?
Use a 0.05 signi cance level to test the claim that when the 13th day of a month falls on Friday, the numbers of hospital admissions from motor vehicle crashes are not a ected.
A simple random sample with n = 300 is drawn from a binomial process in which π =0.4. Determine the following probabilities for p = the proportion of successes:- P(p ≥ 0.35).
When one of the five predictor variables in the preceding example is elimi- nated from the analysis, the value of R2 drops from 0.75 to 0.71. What does this tell us about the variable that was dropped?
If Y follows a Beta(a; b) distribution, then we know that E(Y ) = mu = a/(a + b) and Var(Y ) = sigma^2 = ab/((a + b)^2(a + b + 1)) This gives us mu and sigma^2 in terms of a and b. Derive equations for a and b in terms of mu and sigma^2
What are the checks on the powers of the judiciary? Are they potent and easily invoked, or weak and difficult to invoke?
What is the probability that the trainee class will consist entirely of men or women? Round your answer to the nearest thousandth.
The regional tupperware dealers earned these commissions last month: what was the mean commision earned? round your answers to the nearest cents.
experiment consists of tossing a coin h t and then selecting a vowel a e i o u.a. what is the sample space in this
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 Inches and a standard deviation of 0.01 inches.
Did the Americans (and French) really win the war on the battlefield, or was it more the loss of British political will that led to independence?
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