A political candidate has asked you to conduct a poll on the average number of children her constituents have. If the candidate only wants a 2 child margin of error at a 90% confidence level and...

A political candidate has asked you to conduct a poll on the average number of children her constituents have. If the candidate only wants a 2 child margin of error at a 90% confidence level and assuming σ=6, what sample size is needed? (Note: Round your critical value to three decimal places before computing.)