Question 925703: A local television station wants to estimate the average number of hours people spend watching television each day. They randomly sample 400 individuals in their viewing area and find that, on average, people watch 3.5 hours of television a day. It is known, however, that the population standard deviation is 2.0 hours.
a - determine the standard error of the mean.
b - compute a 99% confidence interval for the mean number of hours spent watching television.
c - interpret the result of the confidence interval in a sentence or two
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! Sample mean = 2.4, SD = 2
SE = 2/sqrt(400)
ME = 2.576 (.1) = .2576
CI: 2.4 - .26 < u < 2.4 + .26
CI: (2.14, 2.66)
CI: (2.1, 2.7)
Use the Number of Decimals Points as Directed for Class Use.
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