Question

A political candidate has asked you to conduct a poll to determine what percentage of people support her.
If the candidate only wants a 1% margin of error at a 98% confidence level, what size of sample is needed?
The political candidate will need to sample____ people.

Assume that a sample is used to estimate a population mean μμ. Find the 95% confidence interval for a sample of size 38 with a mean of 44.3 and a standard deviation of 5.1. Enter your answer accurate to one decimal place.
I am 95% confident that the mean μμ is between___and___

Assume that a sample is used to estimate a population mean μμ. Find the 99.9% confidence interval for a sample of size 28 with a mean of 75.6 and a standard deviation of 20.3. Enter your answer accurate to one decimal place.
I am 99.9% confident that the mean μμ is between___and___

Answer 1