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Question 8 In a study about the revision time of year 1 students in Faculty of Art in examination period. From past studies, the standard
Question 8
In a study about the revision time of year 1 students in Faculty of Art in examination period. From past studies, the standard deviation is estimated to be 45 minutes. Assume the population follows normal distribution.
a) What sample size is needed if the researchers wants to be 90% confident of being correct to within 10 minutes?
b) If 99% confidence is desired, how many students need to be selected?
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