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A nationwide survey found out that the average time that college students spent on their personal computer is 7.5 hours per week. A random sample
A nationwide survey found out that the average time that college students spent on their personal computer is 7.5 hours per week. A random sample of 28 college students showed that they spent 7.1 hours per week using their computers with a standard deviation of 0.7 hours. Test whether the average number of hours spent by the 28 college students is significantly lower than the national average of 7.5 hours.
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