An estimate is needed of the mean acreage of farms in a certain city. A 95% confidence interval should have a margin of error of
22 acres. A study ten years ago in this city had a sample standard deviation of 210 acres for farm size.
acres for farm size. Answer parts (a) and (b).
a. About how large a sample of farms is needed?
n=? (Round up to the nearest integer.)
b. A sample is selected of the size found in (a). However, the sample has a standard deviation of 280 acres rather than 210.
What is the margin of error for a 95% confidence interval for the mean acreage of farms?
m=? (Round to one decimal place as needed.)
a).given data are:-
margin of error (E) = 22
z critical value for 95% confidence level, both tailled test be:-
the needed sample size be:-
b).given data are:-
sample size (n) = 351
[ as n = 351 >30, we can using approximation ]
the margin of error for a 95% confidence interval for the mean acreage of farms be:-
*** if you have any doubt regarding the problem please write it in the comment box.if you are satisfied please give me a LIKE if possible...
Get Answers For Free
Most questions answered within 1 hours.