A 95% confidence interval for is
is unknown but since the sample size is fairly large, you can replace it with
What you want is to find a new such that .
Solving for n you get
I hope someone can work out this problem for me to use as a reference for my homework. Thank you so much in advance.
The length in centimeters if n=29 fish yielded an average length of x=16.82 (i don't know how to put the line over the x) and . Determine the size of a new sample so that x(+/-)0.5 is an approximate 95% confidence interval for .
i am so confused. could you work this problem through? or one similar to this? i thought they were both basically the same numbers, yet i still don't know what to do with them to complete this problem. please help me. i really think im going to need a tutor. thank you for helping