That was quick, ty.
My problem question 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 or cash back.
I am unfamiliar with the scientific cal. and I am having a problem trying to figure out how to put in the formula.
Yes, what HoldMyBeer said. I can most likely solve the problem if I knew what a 90% conf. int. was tho... My own stupidity I suppose