Estimate the proportion of undecided voters
How large a sample is needed to estimate the proportion of undecided voters in the presidential elections if you wish this proportion to be within 0.032, using a confidence level of 0.97, in the most recent survey this proportion was 0.20?
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An investigator hypothesizes which cholesterol levels in children might be affected by educating their parents on proper nutrition and exercise.
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In a random sample of 50 customers out of 400 customers, the average amount spent on groceries was $65.60. Assuming a population standard deviation of $8.50, set up a 90 percent confidence interval for the average amount spent on groceries.
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Police at SUU (Small Unnamed University) have got the report that the student was skateboarding in hall. As it turns out, exactly 1 person committed crime and all students are lying. Find who is guilty party?
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A student should answer 43 or more questions correctly to obtain a grade of A. What percentage of the students who have done their homework and attended lectures will obtain a grade of A on this multiple-choice examination (to 2 decimals)?
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