You may assume that these draws came from an approximately normal distribution. Construct a 95% confidence interval for the true mean order size. [Hint: You should use the function T. INV in Excel, which works much like NORM. INV but since it describes a t-distribution, you must also give it the appropriate degrees of freedom.] (Round your standard deviation answer to 1 decimal place and t-value to 3 decimal places. Round your answers to the nearest whole number.)