Cоmpаring аn expоnentiаl distributiоn and a Weibull distribution with shape parameter 2, if we want to do a life test to prove either the MTTF of exponential distribution is longer than 1000 hours or the characteristic life of Weibull distribution is longer than 1000 hours, and the test lasts 100 hours, then which test should require larger number of test units?