could someone please explain the concept of sampling error? i can't really find it in my text book
ahh thanks
also i am stuck on two more problems. (last ones, i swear! haha)
st dev=1200
want a 95% confidence interval for the population value of annual telephone expenditure with an error of estimation (sampling error) no greater than $50
what sample size should be used?
suppose that we want a 95% confidence interval for the population value of annual telephone expenditure that is no wider than $100
what sample size should be used?