According to a report of a technician, the mean time spent by students using internet in Lab I is 20.6 hours and in Lab II is 27.5 hours in a week. Suppose that these means are based on a random sample of 30 computers in Lab I and 45 computers in Lab II. The standard deviations are 4.59 and 3.35 hours for Lab I and II, respectively. Construct a
92%
confidence interval for the difference in mean time spent by students using internet between the two labs.

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According to a report of a technician, the mean time spent by students using internet in Lab I is 20.6 hours and in Lab II is 27.5 hours in a week. Suppose that these means are based on a random sample of 30 computers in Lab I and 45 computers in Lab II. The standard deviations are 4.59 and 3.35 hours for Lab I and II, respectively. Construct a

92%

confidence interval for the difference in mean time spent by students using internet between the two labs.

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