Posted by Monique on Wednesday, June 11, 2008 at 11:59pm.
The estimate of the population proportion is to be within plus or minus .10, with a 99 percent level of confidence. The best estimate of the population proportion is .45. How large a sample is required?

Statistics #3  MathGuru, Thursday, June 12, 2008 at 12:02pm
Here is one formula you might use for this problem:
n = [(zvalue)^2 * p * q]/E^2
With your data:
n = [(2.575)^2 * .45 * .55]/.10^2
I'll let you finish the calculation (round to the next highest whole number).
Note: n = sample size needed; .45 for best estimate of the population proportion; .55 for q, which is (1  p). E = maximum error, which is .10 from the problem. Zvalue is found using a ztable (for 99%, the value is 2.575).
I hope this helps.

Statistics #3  Monique, Thursday, June 12, 2008 at 4:14pm
THANK YOU
Answer This Question
Related Questions
 Statistics  The estimate of the population proportion is to be within plus or ...
 Statistics  Suppose the U.S. president wants an estimate of the proportion of ...
 Statistics  Find the minimum sample size that should be chosen to assure that ...
 Elementary Statistics  1) Construct a confidence interval of the population ...
 Statistics  An auditor wants to estimate what proportion of a bank’s commercial...
 statistics  What sample size is required from a very large population to ...
 Business statistics  1. Suppose the estimate of a proportion of a normal ...
 statistics  Determine the sample size required to estimate a population ...
 statistics  The 2003 Statistical Abstract of the United States reported the ...
 Statistics (46)  The 2003 Statistical Abstract of the United States reported ...
More Related Questions