Hello,everybody! I'll be glad if you help me!
Using the following data
30, 40, 50, 20, 20, 40.
construct 95% confidence interval estimate of the popolation mean.
What is the best formula for solving this problem?
E=t * S/sqrN (1)
or 1/2
E=Z * O/sqrN (2)
1/2
WHY?
Thanks for your time.