Posted by **Shannon ** on Thursday, October 6, 2011 at 12:08am.

A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 4% if the true proportion. Find the sample necessary if in a prior study, a sample of 200 people showed that 40 traveled overseas last year. If no estimate of the same proportion is available, how large should a sample be????

show your work please so i can understand :P

- Stat Help -
**MathGuru**, Thursday, October 6, 2011 at 12:01pm
Try this formula:

n = [(z-value)^2 * p * q]/E^2

Note: n = sample size needed; use 40/200 for p (convert to a decimal); use 1 - p for the value of q. E = maximum error, which is .04 for 4%. Z-value is found using a z-table (for 95% confidence). Note: ^2 means squared and * means to multiply.

I'll let you take it from here.

## Answer This Question

## Related Questions

- statistics - please help - A researcher wishes to be 95% confident that her ...
- mpc - A reasearcher wishes to be 95% confident that her estimate of the ...
- stat - A researcher at a major clinic wishes to estimate the proportion of the ...
- Statistics - The Academy of Orthopedic Surgeons states that 80% of women wear ...
- statistics - A researcher at a major hospital wishes to estimate the proportion ...
- statics - A manufacturer of golf equipment wishes to estimate the number of left...
- Stats - A manufacturer of golf equipment wishes to estimate the number of left-...
- statistics - The Academy of Orthopedic Surgeons states that 80% of women wear ...
- stats - A human resources manager at a large company wants to estimate the ...
- statistics - A music industry researcher wants to estimate, with a 90% ...

More Related Questions