Homework Help: statistics

Posted by chalulu on Sunday, March 13, 2011 at 5:30pm.

A researcher at a major hospital wishes to estimate the proportion of the adult population of the U.S. that has high blood pressure. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the tgrue proportion by more than 4%?

statistics - MathGuru, Wednesday, March 16, 2011 at 8:50pm
Formula:
n = [(z-value^2 * p * q)]/E^2
...where n = sample size, z-value will be 2.58 using a z-table to represent the 99% confidence interval, p and q represent proportions, E = .04, ^2 means squared, and * means to multiply.

Note: p and q will both be .5 if no value is stated.

Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.
statistics - Ash, Thursday, May 3, 2012 at 12:51am
3

Answer this Question

Related Questions

statistics - Suppose that a researcher is interested in estimating the mean ...
Elementary Statistics - 1) Construct a confidence interval of the population ...
statistics - please help - A researcher wishes to be 95% confident that her ...
statistics - A researcher wishes to estimate with 95% confidence the proportion ...
statistics - Of 1735 people who came into a blood bank to give blood, 373 people...
statistics - A researcher wants to estimate the proportion of a population which...
statistics - A researcher wishes to estimate the mean height of women aged ...
Statistics - A researcher found a sample proportion of 0.94 for estimating the ...
MATH - Of 1936 people who came into a blood bank to give blood, 200 people had ...
Statistics #3 - The estimate of the population proportion is to be within plus ...

For Further Reading

First Name:
School Subject:
Answer: