We've been told to find critical value that corresponds to 80% confidence level.
I dropped 10% from each tail since it's symmetric. Am I right in proceeding by finding where 0.90 is in the table to find out the right limit and then minus that to find the left-end point hoping it leaves 80% in the middle? I am using this z table, can someone tell me if I am proceeding the right way and if not, how to use the Z Table?
I dropped 10% from each tail since it's symmetric. Am I right in proceeding by finding where 0.90 is in the table to find out the right limit and then minus that to find the left-end point hoping it leaves 80% in the middle? I am using this z table, can someone tell me if I am proceeding the right way and if not, how to use the Z Table?