You are conducting a survey of the total credit hours students take each semester at Surry Community College. Historically the population standard deviation is known to be o = 4.7 semester hours. You have spoken with 53 students so far. How many more students should be included in the sample to be 99% sure the sample mean is within one semester hour of the population mean for all students at this college? (Hint: the margin of error is the amount added or subtracted from the mean.)

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