Confidence interval for mean
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5. A researcher wants to estimate the mean number of hours (mu) ; children watch television per day. A sample of 38 children is taken. The sample mean is 6.8 hours with a sample standard deviation of 1.1 hours.
a. Find the 90% confidence interval for mean (mu).
b. Find the 95% confidence interval for mean (mu).
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Solution Summary
Computes the the 90% and 95% confidence interval for mean number of hours children watch television per day. Excel file is included.
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5. Data:
Sample mean= Xbar = 6.8 hours
Sample Standard deviation = 1.1 hours
Sample size = 38
Population standard deviation (Known, Not Known) = Not Known.
No. of tails = 2 (as we are calculating the confidence interval).
Since sample size is more than 30 use normal distribution.
Thus, we use z distribution.
a. Find the 90% confidence interval ...
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