A medical devices company wants to know the number of hours their MRI machines are used per day.A previous study found a standard deviation of four hours.How many MRI machines must the company find data for in order to have a margin of error of at most 0.5 hours when calculating a 98% confidence interval?
A)346.26
B)347
C)424.69
D)425

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The Answer of A medical devices company wants to know the number of hours their MRI machines are used per day.A previous study found a standard deviation of four hours.How many MRI machines must the company find data for in order to have a margin of error of at most 0.5 hours when calculating a 98% confidence interval?
A)346.26
B)347
C)424.69
D)425

A Medical Devices Company Wants to Know the Number of Hours