.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

Guest Oct 26, 2019

edited by
Guest
Oct 26, 2019

#1**+1 **

? What do you want to do? In the mean time, the answer is 0.31481-1.645 = **-1.33019**.

ThatOnePerson Oct 26, 2019