A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 36 families of four vacationing at Niagara Falls resulted in a sample mean of $218.90 per day and a sample standard deviation of $73.50. Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls (to 2 decimals).