.31481 +(-) 1.645
My problem is:
Of 54 bank customers depositing a check, 17 received some cash back.
(a) Construct a 90% conf. int. for the proportion of all depositors who ask for cash back.
I am not familiar with the scientific calculator and I am having a problem on how to insert the formula. Any help would greatly be appreciated.
Patti
+321 ? What do you want to do? In the mean time, the answer is 0.31481-1.645 = -1.33019.
