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Calculate the sample size used to obtain interval

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It is known that the average number of weekly hours of exercise done by students from a certain university is normally distributed with a standard deviation of 4 hours. The estimation of said average was made using confidence intervals, it turned out that the upper limit of said interval is 19.24. What we know is that the sample mean taken to make this estimate was 18 and the confidence level was 99.5%. Calculate the sample size used to obtain this interval (Express your answer as a whole number).

Reference no: EM132529287

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