A company that manufactures tools want to estimate the average output of a machine to within a margin of error of 2.1 units with 90% confidence. A preliminary pilot study found that the sample standard deviation of the machine's output is 7.3 units. 1) What is the preliminary estimate n*? Round to the nearest whole number. Check Show answer 2) What is the sample size n? The critical value when df = 32 is t* = 1.694. Round to the nearest whole number. Check Show answer