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Of 41 bank customers depositing a check, 15 received some cash back. (a) Construct a 90 percent confidence interval for the proportion of all depositors

Of 41 bank customers depositing a check, 15 received some cash back.

(a)Construct a 90 percent confidence interval for the proportion of all depositors who ask for cash back.(Round your answers to 4 decimal places.)

The 90% confidence interval is from ? to ?

(b)May normality ofpbe assumed?

Yes

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