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A principal at a large high school is interested in determining how much time her students spend on their phones each day. The table below

A principal at a large high school is interested in determining how much time her students spend on their phones each day. The table below shows the mean and standard deviation of the amount of time spent on the phone each night (in minutes) for a random sample of 35 seniors and a separate random sample of 40 juniors at this school. Mean Standard Deviation Seniors 442 15.8 Juniors 405 14.4

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