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Confidence interval for population proportion.

Of 43 bank customers depositing a check, 18 received some cash back. (a) Construct a 90% confidence interval for the proportion of all depositors who ask for cash back. (b) Check the normality assumption.

Solution Summary

The solution provides step by step method for confidence with calculation and Interpretations of the results. Construct a 90% confidence interval for the proportion of all depositors who ask for cash back. The normality assumption is also validated here.

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