Asked by Valerie
A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is needed to get the desired information to be accurate within 0.68 decibels?
Answers
Answered by
MathGuru
Formula:
n = [(z-value * sd)/E]^2
...where n = sample size, z-value will be found using a z-table for 90% confidence, sd = 4.13, E = 0.68, ^2 means squared, and * means to multiply.
Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.
n = [(z-value * sd)/E]^2
...where n = sample size, z-value will be found using a z-table for 90% confidence, sd = 4.13, E = 0.68, ^2 means squared, and * means to multiply.
Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.