Question: Please help According to a large online retailer, the proportion of customers making a purchase during the month of July was satisfied with the online

Please help

According to a large online retailer, the proportion of customers making a purchase during the month of July was satisfied with the online ordering process 64% of the time. They have reason to believe the proportion of customers making a purchase during the month of December who is satisfied with the online ordering process is lower than 64%. What is the minimum sample size required to meet the requirements for this test? Round to the whole number

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