For an effective parental skill study, a researcher asked: How many hours do the kids watch the television during a typical week in Barcelona? The mean of 100 Kids (ages 6-11) spend about 23 hours a week in front of the TV. Suppose the study follows a normal distribution with standard deviation 4.

1. Estimate the mean of all kids (ages 6-11) in Barcelona, using 95% confidence interval. (show all the calculations)
2. Write the conclusion of your result