Calculate a confidence interval
In a survey of 500 people, 60% responded with agreement to an attitude question. Calculate a confidence interval at 95% to get an interval estimate for a porportion.
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A wire of length L and resistance R is cut in half, and the two halves are connected in parallel. What is the resistance of the parallel combination?
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A researcher expects the population proportion of Cubs fans in Chicago to be 80%. The researcher wishes to have an error of less than 5% and to be 95% confident of an estimate to be made from a mail survey. What sample size is required? (Please ca
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Two oppositely charged parallel plates with an electric field of 80 V/m have potential difference of 40 V. A tiny sphere of mass 50 mg with 2120 excess electrons is placed in the field and sits on the positive plate.
Determine the distribution function x -> P (X equal or less than x). (Hint: Remember that the life of the entire system is equal to the maximum of the lifetimes of the two copies of the item.)
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