A random sample of 50 four-year-olds 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. Round the interval to dollars without the dollar symbol, example 1234 < μ &λτ; 5678. Z value from the table for the formula: Blank 1 Z-interval: Blank 2 < μ < Blank 3