Let pE,F be the proportion of female orders that are paid for with the ElecMart credit card,
Question:
a. Find a 95% confidence interval for pE,F; for pE,M; for the difference pE,F - pE,M.
b. Let pE,F,Wd be the proportion of female orders on weekdays that are paid for with the ElecMart credit card, and let pE,F,We be the similar proportion for weekends. Define pE,M,Wd and pE,M,We similarly for males. Find a 95% confidence interval for the difference (pE,F,Wd - pE,M,Wd) - (pE,F,We - pE,M,We). Interpret this difference in words. Why might it be of interest to ElecMart?
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Related Book For 
Data Analysis and Decision Making
ISBN: 978-0538476126
4th edition
Authors: Christian Albright, Wayne Winston, Christopher Zappe
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