3. {1+ 1 + 1 = 3 marks} A manager 1wants to estimate the mean hourly yield for a process that manufactures an antibiotic. He observes the process for 5D hourly periods chosen at random and obtains the sample mean 02 _ oz .'r : 36h {ounces per hour} and sample standard deviation .5" : 4h {ounces per hour}. I" I" a. Estimated mean hourly yield of the process is b. A 905% margin of error for the mean hourly yield is Keep one digit after decimal point in the answer b. c. A 90% confidence interval for mean hourly yield is l____.____ 1 Keep one digit after decimal point in the answer c