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    Confidence interval for population proportion.

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    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.

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    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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