An article in Journal of the American Statistical Association (1990, Vol. 85, pp. 972-985) measured weight of 30 rats under experiment controls. Suppose that there are 12 underweight rats. (a) Calculate a 95% two-sided confidence interval on the true proportion of rats that would show underweight from the experiment. Round your answers to 3 decimal places. i
An article in Journal of the American Statistical Association (1990, Vol. 85, pp. 972-985) measured weight of 30 rats under experiment controls. Suppose that there are 12 underweight rats. (a) Calculate a 95% two-sided confidence interval on the true proportion of rats that would show underweight from the experiment. Round your answers to 3 decimal places. i
College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter8: Sequences, Series, And Probability
Section8.7: Probability
Problem 58E: What is meant by the sample space of an experiment?
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Transcribed Image Text:An article in Journal of the American Statistical Association (1990, Vol. 85, pp. 972-985) measured weight of 30 rats under experiment
controls. Suppose that there are 12 underweight rats.
(a) Calculate a 95% two-sided confidence interval on the true proportion of rats that would show underweight from the experiment.
Round your answers to 3 decimal places.
i
<p< i
(b) Using the point estimate of p obtained from the preliminary sample, what sample size is needed to be 95% confident that the
error in estimating the true value of p is no more than 0.02?
n =
(c) How large must the sample be if we wish to be at least 95% confident that the error in estimating p is less than 0.02, regardless of
the true value of p?
n =
i
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