The number of hours spent watching television by students in
The number of hours spent watching television by students in the week before final exams has a normal distribution with a standard deviation of 4.5 hours. A random sample of 30 students was taken.
a. Is the probability more than 0.95 that the sample standard deviation exceeds 3.5 hours?
b. Is the probability more than 0.95 that the sample standard deviation is less than 6 hours?
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