Question

Managers at an automobile manufacturing plant would like to estimate the mean completion time of an assembly line operation, The managers plan to choose a random sample of completion times and estimate via the sample. Assuming that the standard deviation of the population of completion times is 10.4 minutes, what is the minimum sample si d ed for the managers to be 95% confident that their estimate is within 1.7 minutes of Can your Wermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements) (If necessary, consulta lot of formulas.). 3

Answer 1

ast Answer: Given data = 10.4 ale 95% = 1.7 find, minimum sample size. formula for the minimum sample size n = 2 (og Where E = 6 = 29 = Margin of essor popwation standard Critical value. deviation hle icnow cl=1& that. .. dal-cl. dala 0.95 2 -0.05 critical value (a 20.05 - Zo.025 = 1.96 pson = (1.962 (10,470 415,5074 1.72 2.89 no 143.774 ~ 144 n=144 Ans: size is a The minimum sample In=144