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One random sample of the hours of one type of user watch TV per day was...

One random sample of the hours of one type of user watch TV per day was recorded: 2.9, 3.5, 3, 3.2, 3.3, 3.5, 3.3, 3, 3.5.

1. Apply the backward empirical rule to check normality of the data, and conclude if any evidence of non-normality.

2. Assume that the underlying population is normal. Find a two-sided 99% confidence interval for the the true population average hours.

3. Assume that population variance ?2=0.09 and the bound on the error of estimation of 99% confident interval to be 0.2. Find the minimum sample size ?.

3) Find the probability that between three and five (inclusive) of them use their device to play games.

Math   Statistics-And-Probability   
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