SOLUTION: A random sample of 50 four-year-old’s attending day care centers provided a yearly tuition average of $3987 and the population standard deviation of $630. Find the 90% confidence

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Question 1193226: A random sample of 50 four-year-old’s attending day care centers provided a yearly tuition average of $3987 and the population standard deviation of $630. Find the 90% confidence interval of the true mean.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
90% half-interval is z(0.95)*630/sqrt(50)
=1.645*630/sqrt(50)
=146.56
($3840.44, $4133.46)