Posted by Adam Dane on Sunday, March 31, 2013 at 3:10pm.
Suppose the U.S. president wants an estimate of the proportion of the population who support his current policy toward revisions in the Social Security system. The president wants the estimate to be within 0.028 of the true proportion. Assume a 99 percent level of confidence. The president's political advisers estimated the proportion supporting the current policy to be 0.62
(a) How large of a sample is required?
(b) How large of a sample would be necessary if no estimate were available for the proportion that support current policy?

Statistics  MathGuru, Monday, April 1, 2013 at 6:58pm
(a)Formula to find sample size:
n = [(zvalue)^2 * p * q]/E^2
... where n = sample size, zvalue is found using a ztable for 99% confidence, p = 0.62, q = 1  p, ^2 means squared, * means to multiply, and E = 0.028.
Plug values into the formula and calculate n.
(b) Use p = 0.5 and q = 0.5
Recalculate.
I hope this will help get you started.
Answer This Question
Related Questions
 Statistics  An auditor wants to estimate what proportion of a bank’s commercial...
 statistics  2. An investigator wants to estimate caffeine consumption in high ...
 Statistics #3  The estimate of the population proportion is to be within plus ...
 Statistics  An investigator wants to estimate caffeine consumption in high ...
 Statistics  The estimate of the population proportion is to be within plus or ...
 statistics  The 2003 Statistical Abstract of the United States reported the ...
 Statistics (46)  The 2003 Statistical Abstract of the United States reported ...
 statistics  An investigator wants to estimate caffeine consumption in high ...
 statistics  John Davis, a manager of a supermarket, wants to estimate the ...
 Data Analysis  A) An insurance company wants to estimate the proportion of ...
More Related Questions