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+0  
 
0
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.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

 Oct 26, 2019
edited by Guest  Oct 26, 2019
 #1
avatar+236 
+1

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

 Oct 26, 2019

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