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A teacher wants to estimate the mean number of hours that her students study the day before a test. The error in estimating the mean
A teacher wants to estimate the mean number of hours that her students study the day before a test. The error in estimating the mean is to be lees than 0.2 hours a 90% level of confidence. The teacher found a similar study that stated that the standard deviation was 1.4 hours. What is the minimum required sample size?
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